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Stock Incentive Plans - Restricted Stock Units Award Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 07, 2016
Oct. 15, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Management Incentive Plan 2014          
Aggregate fair value (in millions)          
Vesting Year   25.00%      
Restricted Stock | Chief Financial Officer          
Restricted Shares          
Granted (in shares) 233,863        
Restricted Stock | Management Incentive Plan 2014          
Restricted Shares          
Beginning balance (in shares)     52,140    
Forfeited (in shares)     (83)    
Vested (in shares)     (1,432) (133,452)  
Ending balance (in shares)     50,625 52,140  
Price on grant date          
Beginning balance (in dollars per share)     $ 42.19    
Ending balance (in dollars per share)     $ 5.90 $ 42.19  
Restricted Stock | Management Incentive Plan 2014 | Chief Financial Officer          
Restricted Shares          
Beginning balance (in shares)     233,863    
Granted (in shares) 233,863        
Ending balance (in shares)     233,863 233,863  
Price on grant date          
Beginning balance (in dollars per share)     $ 4.24    
Granted, price on grant date (in dollars per share) $ 4.24        
Ending balance (in dollars per share)     $ 4.24 $ 4.24  
Aggregate fair value (in millions)          
Beginning balance, aggregate fair value     $ 1,000    
Granted, aggregate fair value $ 1,000        
Ending balance, aggregate fair value     $ 1,000 $ 1,000  
Restricted Stock | 2016 Equity Compensation Plan          
Restricted Shares          
Beginning balance (in shares)     1,430,925 993,925  
Forfeited (in shares)       (10,750)  
Forfeitures and cancellations (in shares)     (537,942)    
Ending balance (in shares)     1,212,465 1,430,925 993,925
Price on grant date          
Beginning balance (in dollars per share)     $ 5.70 $ 5.90  
Forfeited during period (in dollars per share)       5.47  
Forfeitures and cancellations (in dollars per share)     5.81    
Ending balance (in dollars per share)     $ 4.79 $ 5.70 $ 5.90
Aggregate fair value (in millions)          
Beginning balance, aggregate fair value     $ 8,150 $ 5,780  
Forfeited, aggregate fair value       (60)  
Forfeitures and cancellations, aggregate fair value     (3,130)    
Ending balance, aggregate fair value     $ 5,810 $ 8,150 $ 5,780
Restricted Stock | 2016 Equity Compensation Plan | Vesting Year 3 | Chief Financial Officer          
Aggregate fair value (in millions)          
Vesting Year 100.00%        
Restricted Stock | 2016 Equity Compensation Plan | December 15, 2016, Group 1          
Restricted Shares          
Granted (in shares)         760,056
Price on grant date          
Granted, price on grant date (in dollars per share)         $ 5.90
Aggregate fair value (in millions)          
Granted, aggregate fair value         $ 4,400
Vesting Year       100.00%  
Restricted Stock | 2016 Equity Compensation Plan | December 15, 2016, Group 2          
Restricted Shares          
Granted (in shares)         233,869
Price on grant date          
Granted, price on grant date (in dollars per share)         $ 5.90
Aggregate fair value (in millions)          
Granted, aggregate fair value         $ 1,380
Vesting Year       100.00%  
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2017          
Restricted Shares          
Issued (in shares)       429,750  
Price on grant date          
Issued, price on grant date (in dollars per share)       $ 5.47  
Aggregate fair value (in millions)          
Issued, aggregate fair value       $ 2,350  
Term     3 years    
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2017 | Vesting Year 1          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2017 | Vesting Year 2          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2017 | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | June 1, 2017          
Restricted Shares          
Issued (in shares)       18,000  
Price on grant date          
Issued, price on grant date (in dollars per share)       $ 4.64  
Aggregate fair value (in millions)          
Issued, aggregate fair value       $ 80  
Restricted Stock | 2016 Equity Compensation Plan | June 1, 2017 | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting Year     100.00%    
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018          
Restricted Shares          
Issued (in shares)     948,500    
Price on grant date          
Issued, price on grant date (in dollars per share)     $ 4.71    
Aggregate fair value (in millions)          
Issued, aggregate fair value     $ 4,470    
Term     3 years    
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 1          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 2          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | January 4, 2018 | Vesting Year 3          
Aggregate fair value (in millions)          
Vesting Year     33.00%    
Restricted Stock | 2016 Equity Compensation Plan | January 10, 2018          
Restricted Shares          
Issued (in shares)     30,000    
Vested (in shares)     (30,000)    
Price on grant date          
Issued, price on grant date (in dollars per share)     $ 4.81    
Vested during period (in dollars per share)     $ 4.81    
Aggregate fair value (in millions)          
Issued, aggregate fair value     $ 100    
Vested, aggregate fair value     $ (100)    
Restricted Stock | 2016 Equity Compensation Plan | March 1, 2018          
Restricted Shares          
Vested (in shares)     (90,711)    
Price on grant date          
Vested during period (in dollars per share)     $ 5.47    
Aggregate fair value (in millions)          
Vested, aggregate fair value     $ (500)    
Restricted Stock | 2016 Equity Compensation Plan | September 1, 2018          
Restricted Shares          
Vested (in shares)     (408,143)    
Price on grant date          
Vested during period (in dollars per share)     $ 5.90    
Aggregate fair value (in millions)          
Vested, aggregate fair value     $ (2,410)    
Restricted Stock | 2016 Equity Compensation Plan | October 14, 2018          
Restricted Shares          
Vested (in shares)     (130,164)    
Price on grant date          
Vested during period (in dollars per share)     $ 5.90    
Aggregate fair value (in millions)          
Vested, aggregate fair value     $ (770)