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Long-Term Debt - Convertible Subordinated Notes (Details)
$ / shares in Units, shares in Millions, instrument in Millions
1 Months Ended 12 Months Ended 13 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2009
USD ($)
d
$ / shares
Dec. 31, 2016
USD ($)
instrument
shares
Nov. 30, 2015
USD ($)
Nov. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
shares
Debt Instrument [Line Items]            
Convertible subordinated notes $ 84,800,000   $ 35,600,000     $ 84,800,000
Threshold trading days | d   5        
Make whole premium, additional percent   5.00%        
Percentage of repurchase of common stock   2.50%        
Percentage of conversion price of applicable trading day   97.50%        
Conversion of debt to common stock 0   49,000,000 $ 49,000,000 $ 0  
Second Trading Day Immediately Preceding Record Date [Member]            
Debt Instrument [Line Items]            
Consecutive trading days   20 days        
Second Trading Day Immediately Preceding Redemption Date [Member]            
Debt Instrument [Line Items]            
Consecutive trading days   20 days        
Second Trading Day Immediately Preceding Option Repurchase Date [Member]            
Debt Instrument [Line Items]            
Consecutive trading days   40 days        
4 1/16% Convertible Subordinated Debentures [Member]            
Debt Instrument [Line Items]            
Convertible subordinated notes $ 84,600,000 $ 200,000,000.0 $ 35,600,000     84,600,000
Convertible debentures into shares of common stock (in shares) | instrument     3.9      
Debt instrument interest rate stated percentage   4.0625% 4.0625%      
Common stock conversion rate     111.0926      
Conversion price per share (in USD per share) | $ / shares   $ 9.00        
Conversion rate of notes to common stock   150.00%        
Threshold trading days | d   20        
Consecutive trading days   30 days        
Repurchase price, percentage of principal amount   100.00% 100.00%      
Proceeds from issuance of debt         194,100,000  
Conversion of debt to common stock     $ 49,000,000     $ 49,000,000
Principal amount repurchased         $ 59,600,000  
Conversion of debt to common stock (in shares) | shares     5.4     5.5
4 1/16% Convertible Subordinated Debentures [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Repurchase price, percentage of principal amount         195.00%  
4 1/16% Convertible Subordinated Debentures [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Repurchase price, percentage of principal amount         212.00%  
4 1/16% Convertible Subordinated Debentures [Member] | Prior to Notice of Redemption Date [Member]            
Debt Instrument [Line Items]            
Threshold trading days | d   5