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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following as of:
 
September 30, 2017
 
December 31, 2016
 
(in thousands)
Senior notes:
 
 
 
1.125% Convertible Notes due 2021:
 
 
 
Principal amount
$
200,000

 
$
200,000

Unamortized discount
(32,153
)
 
(37,475
)
Unamortized debt issuance costs
(3,859
)
 
(4,584
)
1.125% Convertible Notes due 2021, net of unamortized discount and debt issuance costs
163,988

 
157,941

 
 
 
 
7.75% Senior Notes due 2022:
 
 
 
Principal amount
500,000

 
500,000

Unamortized debt issuance costs
(5,602
)
 
(6,443
)
7.75% Senior Notes due 2022, net of unamortized debt issuance costs
494,398

 
493,557

 
 
 
 
6.125% Senior Notes due 2024:
 
 
 
Principal amount
400,000

 
400,000

Unamortized debt issuance costs
(6,815
)
 
(7,544
)
6.125% Senior Notes due 2024, net of unamortized debt issuance costs
393,185

 
392,456

 
 
 
 
Total senior notes
1,051,571

 
1,043,954

 
 
 
 
Revolving credit facility
—

 
—

Total long-term debt, net of unamortized discount and debt issuance costs
$
1,051,571

 
$
1,043,954