Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.4.0.3
Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Aug. 18, 2014
Dec. 21, 2012
Oct. 17, 2012
Debt Instrument [Line Items]          
Net unamortized original issue (discount) premium, net (5) [1] $ (11,930) $ (12,493)      
Fair value of notes 924,300        
October Notes          
Debt Instrument [Line Items]          
Unamortized discount 2,400        
Net unamortized original issue (discount) premium, net (5) 4,800        
December Notes          
Debt Instrument [Line Items]          
Unamortized premium 300        
Net unamortized original issue (discount) premium, net (5) 1,100        
August Notes          
Debt Instrument [Line Items]          
Unamortized premium 14,000        
Net unamortized original issue (discount) premium, net (5) 4,700        
April Notes          
Debt Instrument [Line Items]          
Net unamortized original issue (discount) premium, net (5) 6,600        
Senior Notes          
Debt Instrument [Line Items]          
Carrying value of debt $ 944,700        
Unamortized discount         $ 3,700
Unamortized premium     $ 18,000 $ 500  
[1] The October Notes were issued at a price of 98.534% resulting in a gross discount of $3.7 million and an effective rate of 8.000%. The December Notes were issued at a price of 101.000% resulting in a gross premium of $0.5 million and an effective rate of 7.531%. The August Notes were issued at a price of 106.000% resulting in a gross premium of $18.0 million and an effective rate of 6.561%. The April Notes were issued at par. The premium and discount are being amortized using the effective interest method.