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Convertible Senior Notes (Details)
12 Months Ended
Aug. 18, 2014
USD ($)
Mar. 17, 2014
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]          
Proceeds from issuance of convertible senior notes     $ 0 $ 256,970,000 $ 0
Convertible senior notes, carrying value     $ 248,173,000 $ 246,464,000  
Convertible Debt [Member] | 2019 Notes [Member]          
Debt Instrument [Line Items]          
Share price (in dollars per share) | $ / shares     $ 17.23    
Conversion price (in dollars per share) | $ / shares     $ 17.88    
Equity component of senior notes     $ 11,445,000    
Interest expense on debt     14,011,000    
Additional non-cash interest expense     3,440,000    
Convertible Debt [Member] | March 2019 Notes [Member]          
Debt Instrument [Line Items]          
Principal Amount   $ 143,750,000      
Coupon Rate   5.50%      
Effective Rate   6.25%      
Conversion Rate   55.9411      
Remaining Period of Amortization (years)   3 years 2 months 16 days      
Proceeds from issuance of convertible senior notes   $ 139,037,000      
Convertible senior notes, carrying value     140,623,000    
Unamortized discount     3,127,000    
Convertible Debt [Member] | August 2019 Notes [Member]          
Debt Instrument [Line Items]          
Principal Amount $ 111,000,000        
Coupon Rate 5.50%        
Effective Rate 6.50%        
Conversion Rate 55.9411        
Remaining Period of Amortization (years) 3 years 2 months 16 days        
Proceeds from issuance of convertible senior notes $ 109,615,000        
Convertible senior notes, carrying value     107,550,000    
Unamortized discount     $ 3,450,000