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Convertible Senior Notes (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Convertible Debt [Member]
2019 Notes [Member]
Sep. 30, 2014
Convertible Debt [Member]
2019 Notes [Member]
Mar. 17, 2014
Convertible Debt [Member]
March 2019 Notes [Member]
Sep. 30, 2014
Convertible Debt [Member]
March 2019 Notes [Member]
Mar. 17, 2014
Convertible Debt [Member]
March 2019 Notes [Member]
Aug. 18, 2014
Convertible Debt [Member]
August 2019 Notes [Member]
Mar. 17, 2014
Convertible Debt [Member]
August 2019 Notes [Member]
Aug. 18, 2014
Convertible Debt [Member]
August 2019 Notes [Member]
Mar. 17, 2014
Convertible Debt [Member]
August 2019 Notes [Member]
Debt Instrument [Line Items]                        
Principal amount               $ 143,750     $ 111,000 $ 111,000
Coupon rate               5.50%     5.50% 5.50%
Proceeds from issuance of convertible senior notes 256,970 0       139,037     109,593      
Convertible senior notes, carrying value 246,054   0         139,564     106,490  
Unamortized discount             4,186       4,511  
Effective rate               6.25%       6.50%
Conversion rate           55.3649       55.3649    
Remaining period of amortization           4 years 5 months 16 days       4 years 5 months 16 days    
Share price       $ 15.71 $ 15.71              
Conversion price       $ 18.06 $ 18.06              
Equity component of the notes 11,445       11,445              
Interest expense on debt       2,706 4,990              
Additional non-cash interest expense       $ 299 $ 529