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Convertible Senior Notes (Details)
 12 Months Ended
Aug. 18, 2014
USD ($)
Mar. 17, 2014
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]          
Proceeds from issuance of convertible senior notes     $ 0 $ 0 $ 256,970,000
Convertible senior notes, net     249,994,000 $ 248,173,000  
Convertible Debt [Member]          
Debt Instrument [Line Items]          
Conversion rate basis, principal amount     $ 1,000,000    
Convertible Debt [Member] | 2019 Notes [Member]          
Debt Instrument [Line Items]          
Share price (in dollars per share) | $ / shares     $ 16.62    
Conversion price (in dollars per share) | $ / shares     $ 17.62    
Equity component of senior notes     $ 11,445,000    
Interest expense on debt     14,011,000    
Additional non-cash interest expense     3,557,000    
Convertible Debt [Member] | March 2019 Notes [Member]          
Debt Instrument [Line Items]          
Principal amount   $ 143,750,000      
Coupon rate   5.50%      
Proceeds from issuance of convertible senior notes   $ 139,037,000      
Convertible senior notes, net     141,531,000    
Unamortized discount     2,219,000    
Effective rate   6.25%      
Conversion rate   56.7586      
Remaining period of amortization (years)   2 years 2 months 16 days      
Convertible Debt [Member] | August 2019 Notes [Member]          
Debt Instrument [Line Items]          
Principal amount $ 111,000,000        
Coupon rate 5.50%        
Proceeds from issuance of convertible senior notes $ 109,615,000        
Convertible senior notes, net     108,463,000    
Unamortized discount     $ 2,537,000    
Effective rate 6.50%        
Conversion rate 56.7586        
Remaining period of amortization (years) 2 years 2 months 16 days