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Convertible Subordinated Notes (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 19, 2014
Convertible Subordinated Notes [Member]
component
Mar. 31, 2014
Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]        
Stated interest rate percentage     2.75%  
Convertible debt, conversion to number of shares (per $1,000)     44.3169  
Convertible debt, conversion base amount (in dollars)     $ 1,000  
Convertible debt, conversion rate (in dollars per share)     $ 22.56  
Early debt conversion feature, stock price exceeds conversion price, term     20 days  
Early debt conversion feature, stock price exceeds conversion price, term prior to end of reporting period     30 days  
Early debt conversion feature, stock price exceeds conversion price, percent     130.00%  
Early debt conversion feature, trade price less than product of sales price and conversion rate, business day period     5 days  
Early debt conversion feature, trade price less than product of sales price and conversion rate, trade day period     5 days  
Early debt conversion feature, trade price less than product of sales price and conversion rate, base principal amount     1,000  
Early debt conversion feature, trade price less than product of sales price and conversion rate, percentage     98.00%  
Debt redemption price, percentage     100.00%  
Fair value inputs, bond discount rate     6.75%  
Accrued debt issuance costs       800,000
Debt transaction costs     5,100,000  
Convertible subordinated notes, term     7 years  
Number of recognition components, convertible subordinated notes     2  
Deferred tax liability       12,700,000
Carrying Values of Liability and Equity Components, Convertible Subordinated Notes        
Convertible subordinated notes, principal amount     143,750,000 143,750,000
Unamortized discount of liability component       (31,489,000)
Carrying value of the liability component       112,261,000
Equity component carrying value       31,660,000
Convertible subordinated notes, fair value       151,700,000
Contractual coupon interest expense       100,000
Amortization of debt issuance costs 232,000 (638,000)   44,000
Accretion of discount, convertible subordinated notes       200,000
Effective interest rate percentage       6.75%
Payment of debt transaction costs     $ 4,300,000