Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Parenthetical) (Details)

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Selected Quarterly Financial Data (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]          
Gain on debt transactions $ 47,100 $ 7,800 $ 47,109 $ 7,811 $ 123,923
Derivative gain $ 59,700   $ 53,798 $ 4,199 $ (2,926)