Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.5.0.2
Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Aug. 18, 2014
Dec. 21, 2012
Oct. 17, 2012
Debt Instrument [Line Items]          
Net unamortized debt issuance costs $ 16,567 $ 17,883      
Fair value of notes 960,400        
October Notes          
Debt Instrument [Line Items]          
Unamortized discount 2,300        
Net unamortized debt issuance costs 4,600        
December Notes          
Debt Instrument [Line Items]          
Unamortized premium 300        
Net unamortized debt issuance costs 1,000        
August Notes          
Debt Instrument [Line Items]          
Unamortized premium 13,300        
Net unamortized debt issuance costs 4,500        
April Notes          
Debt Instrument [Line Items]          
Net unamortized debt issuance costs 6,400        
Senior Notes          
Debt Instrument [Line Items]          
Carrying value of debt $ 944,800        
Unamortized discount         $ 3,700
Unamortized premium     $ 18,000 $ 500