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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following as of:
 
June 30, 2018
 
December 31, 2017
 
(in thousands)
Senior notes:
 
 
 
1.125% Convertible Notes due September 2021:
 
 
 
Principal amount
$
200,000

 
$
200,000

Unamortized discount
(26,600
)
 
(30,328
)
Unamortized debt issuance costs
(3,128
)
 
(3,615
)
Net of unamortized discount and debt issuance costs
170,272

 
166,057

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

 
400,000

Unamortized debt issuance costs
(6,080
)
 
(6,570
)
Net of unamortized debt issuance costs
393,920

 
393,430

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

 
600,000

Unamortized debt issuance costs
(7,075
)
 
(7,555
)
Net of unamortized debt issuance costs
592,925

 
592,445

 
 
 
 
Total senior notes
1,157,117

 
1,151,932

 
 
 
 
Revolving credit facility due May 2023
22,000

 
—

Total long-term debt, net of unamortized discount and debt issuance costs
$
1,179,117

 
$
1,151,932