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Debt - Schedule of Debt Obligations (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Aug. 25, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Convertible senior notes, interest rates 4.50%    
Revolving credit facility, interest rates 4.38%    
Capital leases for equipment, interest rates 14.20%    
Convertible senior notes, term (months) 60 months    
Revolving credit facility, term (months) 60 months    
Capital leases for equipment, term (months) 59 months    
Convertible senior notes $ 120,653,000   $ 133,742,000
Revolving credit facility 0   75,000,000
Notes payable 2,901,000   2,205,000
Capital leases for equipment 235,000   196,000
Total debt 623,789,000   211,143,000
Less: unamortized bond discount (18,314,000)   (27,474,000)
Less: current maturities of long-term debt (2,907,000)   (2,028,000)
Total long-term debt, net of current maturities 602,568,000   181,641,000
Senior Notes Due 2019 [Member]
     
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.875% 7.875%  
Term 60 months    
Total debt $ 500,000,000 $ 500,000,000.0 $ 0