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Summary of Significant Accounting Policies - Equity Statement (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings, beginning |  | $ 2,343,878 | $ 3,535,746 | $ 3,741,316
Balance at beginning of period |  | 1,323,329 | 2,398,169 | 2,628,755
Retained earnings, ending | $ 1,616,595 | 2,169,002 | 2,343,878 | 3,535,746
Balance at end of period | 656,803 | 1,247,099 | 1,323,329 | 2,398,169
As Previously Reported |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings, beginning |  | 2,460,224 | 3,545,359 | 3,745,815
Balance at beginning of period |  | 1,439,675 | 2,407,782 | 2,633,254
Retained earnings, ending | 1,629,257 | 2,179,358 | 2,460,224 | 3,545,359
Balance at end of period | 669,465 | 1,257,455 | 1,439,675 | 2,407,782
Adjustments |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings, beginning |  | (116,346) | (9,613) | (4,499)
Balance at beginning of period |  | (116,346) | (9,613) | (4,499)
Retained earnings, ending | (12,662) | (10,356) | (116,346) | (9,613)
Balance at end of period | $ (12,662) | $ (10,356) | $ (116,346) | $ (9,613)

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