Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details)

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Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Offsetting [Abstract]    
Gross amount of recognized derivative assets $ 446,109 $ 340,576
Gross amount of derivative liabilities offset against derivative assets in the balance sheet (172,061) (30,658)
Net amount of derivative assets presented in the balance sheet 274,048 309,918
Gross amount of derivative liabilities not offset against derivative assets in the balance sheet (46,074) (31,903)
Gross amount of cash collateral received not offset against derivative assets in the balance sheet 0 0
Net amount of derivative assets after effects of amounts offset and not offset in the balance sheet 227,974 278,015
Gross amount of recognized assets subject to master netting arrangements or similar agreements 446,109 340,576
Gross amount of liabilities offset against assets subject to master netting arrangements or similar agreements in the balance sheet (172,061) (30,658)
Net amount of assets subject to master netting arrangements or similar agreements presented in the balance sheet 274,048 309,918
Gross amount of liabilities not offset against assets subject to master netting arrangements or similar agreements in the balance sheet (46,074) (31,903)
Gross amount of cash collateral received not offset against assets subject to master netting arrangements or similar agreements in the balance sheet 0 0
Net amount of assets subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet 227,974 278,015
Gross amount of recognized repurchase agreements (19,148,679) (19,451,207)
Gross amount of financial assets offset against repurchase agreements in the balance sheet 0 0
Net amount of repurchase agreements presented in the balance sheet (19,148,679) (19,451,207)
Gross amount of financial assets not offset against repurchase agreements in the balance sheet 19,148,679 19,451,207
Gross amount of cash collateral pledged not offset against repurchase agreements in the balance sheet 0 0
Net amount of repurchase agreements after effects of amounts offset and not offset in the balance sheet 0 0
Gross amount of recognized derivative liabilities (218,135) (62,561)
Gross amount of derivative assets offset against derivative liabilities in the balance sheet 172,061 30,658
Net amount of derivative liabilities presented in the balance sheet (46,074) (31,903)
Gross amount of derivatives assets not offset against derivative liabilities in the balance sheet 46,074 31,903
Gross amount of cash collateral pledged not offset against derivative liabilities in the balance sheet 0 0
Net amount of derivative liabilities after effects of amounts offset and not offset in the balance sheet 0 0
Gross amount of recognized liabilities subject to master netting arrangements or similar agreements (19,366,814) (19,513,768)
Gross amount of assets offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 172,061 30,658
Net amount of liabilities subject to master netting arrangements or similar agreements presented in the balance sheet (19,194,753) (19,483,110)
Gross amount of assets not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 19,194,753 19,483,110
Gross amount of cash collateral pledged not offset against liabilities subject to master netting arrangements or similar agreements in the balance sheet 0 0
Net amount of liabilities subject to master netting arrangements or similar agreements after effects of amounts offset and not offset in the balance sheet $ 0 $ 0