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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Schedule of Borrowing Base Utilization, Credit Facility [Table Text Block]
Effective as of April 8, 2016, the revised borrowing base utilization grid under the Amended Credit Agreement is as follows:

Borrowing Base Utilization Grid
Borrowing Base Utilization Percentage
 
<25%
 
≥25% <50%
 
≥50% <75%
 
≥75% <90%
 
≥90%
Eurodollar Loans
 
1.750
%
 
2.000
%
 
2.250
%
 
2.500
%
 
2.750
%
ABR Loans or Swingline Loans
 
0.750
%
 
1.000
%
 
1.250
%
 
1.500
%
 
1.750
%
Commitment Fee Rate
 
0.300
%
 
0.300
%
 
0.350
%
 
0.375
%
 
0.375
%
Schedule of Line of Credit Facilities [Table Text Block]
The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Amended Credit Agreement as of July 27, 2016, and June 30, 2016, and under the Credit Agreement as of December 31, 2015:

 
As of July 27, 2016
 
As of June 30, 2016
 
As of December 31, 2015
 
(in thousands)
Credit facility balance (1)
$
330,000

 
$
330,500

 
$
202,000

Letters of credit (2)
$
200

 
$
200

 
$
200

Available borrowing capacity
$
919,800

 
$
919,300

 
$
1,297,800

____________________________________________
(1) Deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and thus are not deducted from the credit facility balance.
(2) Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.
Schedule of Long-term Debt Instruments [Table Text Block]
The Senior Notes, net of unamortized deferred financing costs line on the accompanying balance sheets as of June 30, 2016, and December 31, 2015, consisted of the following:

 
As of June 30, 2016
 
As of December 31, 2015
 
Senior Notes
 
Unamortized Deferred Financing Costs
 
Senior Notes, Net of Unamortized Deferred Financing Costs
 
Senior Notes
 
Unamortized Deferred Financing Costs
 
Senior Notes, Net of Unamortized Deferred Financing Costs
 
(in thousands)
6.50% Senior Notes due 2021
$
346,955

 
$
3,721

 
$
343,234

 
$
350,000

 
$
4,106

 
$
345,894

6.125% Senior Notes due 2022
561,796

 
7,569

 
554,227

 
600,000

 
8,714

 
591,286

6.50% Senior Notes due 2023
394,985

 
4,801

 
390,184

 
400,000

 
5,231

 
394,769

5.0% Senior Notes due 2024
500,000

 
6,994

 
493,006

 
500,000

 
7,455

 
492,545

5.625% Senior Notes due 2025
500,000

 
8,071

 
491,929

 
500,000

 
8,524

 
491,476

Total
$
2,303,736

 
$
31,156

 
$
2,272,580

 
$
2,350,000

 
$
34,030

 
$
2,315,970