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Convertible Senior Notes (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Mar. 17, 2014
Convertible Debt [Member]
2019 Notes [Member]
Jun. 30, 2014
Convertible Debt [Member]
2019 Notes [Member]
Jun. 30, 2014
Convertible Debt [Member]
2019 Notes [Member]
Mar. 17, 2014
Convertible Debt [Member]
2019 Notes [Member]
Debt Instrument [Line Items]              
Principal amount             $ 143,750
Proceeds from issuance of convertible senior notes 143,750 0   139,037      
Convertible senior notes, carrying value 139,362   0        
Unamortized discount         4,388 4,388  
Coupon rate             5.50%
Effective rate         6.25% 6.25% 6.25%
Conversion Rate       55.3649      
Remaining period of amortization       4 years 9 months 4 days      
Share Price         $ 16.63 $ 16.63  
Conversion price         $ 18.06 $ 18.06  
Equity component of the notes 4,617         4,617  
Interest Expense, Debt         1,977 2,284  
Interest Expense, Debt, Non-cash         $ 199 $ 230