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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Long-Term Debt
Long-term debt consists of the following (in thousands):
 
December 31,
 
2015
 
2014
Senior credit facility
$

 
$

8.75% Senior Secured Notes due 2020, including mandatory prepayment feature liabilities of $2,941, and net of $29,842 discount
1,301,098

 

Senior Unsecured Notes
 
 
 
8.75% Senior Notes due 2020, net of $3,269 and $4,598 discount, respectively
392,666

 
445,402

7.5% Senior Notes due 2021, including a premium of $1,944 and $3,486, respectively
759,711

 
1,178,486

8.125% Senior Notes due 2022
527,737

 
750,000

7.5% Senior Notes due 2023, net of $1,989 and $3,452 discount, respectively
541,572

 
821,548

Convertible Senior Unsecured Notes
 
 
 
8.125% Convertible Senior Notes due 2022, including holder conversion feature liabilities of $21,874, and net of $180,751 discount
82,294

 

7.5% Convertible Senior Notes due 2023, including holder conversion feature liabilities of $7,481, and net of $59,549 discount
26,428

 

Total debt
3,631,506

 
3,195,436

Less: current maturities of long-term debt

 

Long-term debt
$
3,631,506

 
$
3,195,436