Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Derivative Financial Instruments, Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 343,279 $ 388,522
Gross Amounts Offset on the Balance Sheet (89,715) (64,340)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 253,564 324,182
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (20,363) (12,501)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 233,201 311,681
Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 343,279 388,522
Gross Amounts Offset on the Balance Sheet (89,715) (64,340)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 253,564 324,182
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (20,363) (12,501)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 233,201 311,681
Securities Loaned or Sold under Agreements to Repurchase [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (13,640,720) (9,316,351)
Gross Amounts Offset on the Balance Sheet 0 0
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (13,640,720) (9,316,351)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 13,640,720 9,316,351
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (110,078) (76,841)
Gross Amounts Offset on the Balance Sheet 89,715 64,340
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (20,363) (12,501)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 20,363 12,501
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Liability [Member]    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (13,750,798) (9,463,192)
Gross Amounts Offset on the Balance Sheet 89,715 64,340
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (13,661,083) (9,398,852)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 13,661,083 9,398,852
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet $ 0 $ 0