Annual report pursuant to Section 13 and 15(d)

Effective Income Tax Rate Reconciliation (Details)

v3.10.0.1
Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Computed income tax expense at federal rate                 $ (518) $ 104,215 $ 127,957
Federal income tax rate applicable to corporations                 21.00% 35.00% 35.00%
State taxes, net of federal benefit, if applicable                 $ 1 $ 37 $ 106
State taxes, net of federal benefit, if applicable, effective tax rate                 0.00% 0.00% 0.00%
Permanent differences in taxable income from GAAP net income                 $ 28,414 $ 1,208 $ 401
Permanent differences in taxable income from GAAP net income, effective tax rate                 (1152.00%) 0.00% 0.00%
Dividends paid deduction                 $ 13,926 $ (115,942) $ (116,150)
Dividends paid deduction, effective tax rate                 (565.00%) (39.00%) (32.00%)
Provision for (benefit from) income taxes $ 6,681 $ 37,409 $ (6,051) $ 3,784 $ 10,618 $ (5,342) $ 8,759 $ (24,517) $ 41,823 $ (10,482) $ 12,314
Provision for (benefit from) income taxes, effective tax rate                 (1696.00%) (4.00%) 3.00%
Tax provision related to permanent differences in taxable income from GAAP net income                 $ 17,800 $ 17,500