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Convertible Subordinated Notes (Details) - USD ($)
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
May 07, 2018
Dec. 31, 2017
Mar. 19, 2014
Debt Instrument [Line Items]              
Effect of dilutive securities, Convertible junior subordinated debentures (in shares) 0 787 449 980      
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes              
Debt issuance costs $ 0   $ 0     $ (967,000)  
Carrying value of the liability component $ 318,956,000   318,956,000     0  
Contractual coupon interest expense     7,200,000        
Amortization of Debt Issuance Costs     $ 420,000 $ 614,000      
Convertible Subordinated Notes [Member]              
Debt Instrument [Line Items]              
Stated interest rate percentage 2.75%   2.75%       2.75%
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes              
Convertible subordinated notes, principal amount $ 28,764,000   $ 28,764,000   $ 115,000,000 143,750,000 $ 143,750,000
Unamortized discount of liability component (2,796,000)   (2,796,000)     (17,559,000)  
Debt issuance costs (271,000)   (271,000)     (1,750,000)  
Carrying value of the liability component 25,697,000   25,697,000     124,441,000  
Carrying value of the equity component 3,585,000   3,585,000     $ 17,973,000  
Convertible subordinated notes, fair value 31,900,000   31,900,000        
Contractual coupon interest expense 200,000 $ 1,000,000 1,700,000 3,000,000      
Accretion of discount, convertible subordinated notes $ 200,000 $ 1,100,000 $ 2,000,000 $ 3,200,000      
Effective interest rate percentage 3.15% 11.36% 3.15% 11.36%      
Amortization of Debt Issuance Costs $ 27,000 $ 130,000 $ 200,000 $ 400,000