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Compensation Plans - Other Compensation Plan (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Installment
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Mar. 01, 2013
plan
Dec. 31, 2011
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of award plans | plan       2  
Share-based compensation | $ $ 48,384 $ 33,597 $ 74,087    
Shares reserved for stock options and warrants 331,312 641,478      
Unamortized portion of compensation expense for restricted cash awards | $ $ 481,600        
1999 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock available for grant 0        
1999 Stock Option Plan | Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants (shares) 0        
Senior Executive Warrant Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock available for grant 0        
Number of securities called by warrants (shares)         2,000,000
Share-based compensation | $     $ 1,000    
Employee | 1999 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of annual installments | Installment 5        
Director | 1999 Stock Option Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of annual installments | Installment 4