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Net Income per Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended 31 Months Ended
Feb. 14, 2020
Apr. 23, 2019
Apr. 03, 2018
Nov. 02, 2017
May 17, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Class of Stock [Line Items]                    
Dilutive awards (in shares)             130,000 106,000 6,000  
Dividends (in dollars per share)         $ 0.05 $ 3.56        
Dividends             $ 240,394 $ 360,635 $ 796,902 $ 29,300
Cash dividends   $ 230,000     $ 2,700 $ 190,000        
Quarterly dividends declared                   $ 0.05
Special cash dividend (in dollars per share)   $ 4.41                
2016 Equity Plan                    
Class of Stock [Line Items]                    
Dilutive awards (in shares)             70,410      
Restricted Stock | 2016 Equity Plan                    
Class of Stock [Line Items]                    
Common stock issues to employees and directors, unvested (in shares)             98,216     98,216
Vested (in shares)             676,668      
Phantom Share Units (PSUs) | 2016 and 2017 Equity Plans                    
Class of Stock [Line Items]                    
Settlement period             5 years      
Phantom Share Units (PSUs) | 2016 Equity Plan                    
Class of Stock [Line Items]                    
Common stock shares issued (in shares)             43,580      
Restricted Stock Units (RSUs)                    
Class of Stock [Line Items]                    
Common stock issues to employees and directors, unvested (in shares)             161,998     161,998
Restricted Stock Units (RSUs) | 2017 Equity Plan                    
Class of Stock [Line Items]                    
Common stock issues to employees and directors, unvested (in shares)             503,892 191,525   503,892
Dilutive awards (in shares)             39,950      
Common stock shares issued (in shares)             13,157      
Vested (in shares)             60,282      
Restricted Stock Units (RSUs) | 2017 Equity Plan, Additional 2019 Award                    
Class of Stock [Line Items]                    
Dilutive awards (in shares)             19,438      
Stock compensation expense             $ 1,500      
Shares to be issued upon settlement of awards (in shares)             70,989     70,989
Restricted Stock Units (RSUs), Service-Based Vesting Conditions [Member] | 2016 Equity Plan                    
Class of Stock [Line Items]                    
Antidilutive securities excluded from the computation of EPS             98,216      
Restricted Stock | 2017 Equity Plan                    
Class of Stock [Line Items]                    
Antidilutive securities excluded from the computation of EPS             271,589      
Senior Secured Notes Due 2024 | Senior secured notes                    
Class of Stock [Line Items]                    
Cash dividends       $ 600,000            
Payment of special cash dividend       $ 260,000            
Senior Secured Notes Due 2024, New Notes | Senior secured notes                    
Class of Stock [Line Items]                    
Cash dividends     $ 350,000              
Payment of special cash dividend     $ 225,000              
Common Stock | 2017 Equity Plan                    
Class of Stock [Line Items]                    
Vested (in shares)             21,169      
Subsequent Event                    
Class of Stock [Line Items]                    
Dividends (in dollars per share) $ 0.05