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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following as of:
 
March 31, 2018
 
December 31, 2017
 
(in thousands)
Senior notes:
 
 
 
1.125% Convertible Notes due 2021:
 
 
 
Principal amount
$
200,000

 
$
200,000

Unamortized discount
(28,478
)
 
(30,328
)
Unamortized debt issuance costs
(3,371
)
 
(3,615
)
1.125% Convertible Notes due 2021, net of unamortized discount and debt issuance costs
168,151

 
166,057

 
 
 
 
5.75% Senior Notes due 2026:
 
 
 
Principal amount
600,000

 
600,000

Unamortized debt issuance costs
(7,298
)
 
(7,555
)
5.75% Senior Notes due 2026, net of unamortized debt issuance costs
592,702

 
592,445

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

 
400,000

Unamortized debt issuance costs
(6,325
)
 
(6,570
)
6.125% Senior Notes due 2024, net of unamortized debt issuance costs
393,675

 
393,430

 
 
 
 
Total senior notes
1,154,528

 
1,151,932

 
 
 
 
Revolving credit facility
—

 
—

Total long-term debt, net of unamortized discount and debt issuance costs
$
1,154,528

 
$
1,151,932