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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Accounting Standards Update 2016-15, 2016-18 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The accompanying unaudited condensed consolidated statements of cash flows (“accompanying statements of cash flows”) line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 for the nine months ended September 30, 2017, are summarized as follows:
 
For the Nine Months Ended
September 30, 2017
 
As Reported
 
As Adjusted
 
(in thousands)
Cash flows from operating activities:
 
 
 
Non-cash (gain) loss on extinguishment of debt, net
$
22

 
N/A

Loss on extinguishment of debt
N/A

 
$
35

Net cash provided by operating activities
$
370,597

 
$
370,610

 
 
 
 
Cash flows from investing activities:
 
 
 
Acquisition deposit held in escrow
$
3,000

 
N/A

Net cash provided by (used in) investing activities
$
69,007

 
$
66,007

 
 
 
 
Cash flows from financing activities:
 
 
 
Cash paid for extinguishment of debt (1)
N/A

 
$
(13
)
Net cash used in financing activities
$
(7,561
)
 
$
(7,574
)
 
 
 
 
Net change in cash and cash equivalents
$
432,043

 
N/A

Net change in cash, cash equivalents, and restricted cash
N/A

 
$
429,043

Cash and cash equivalents at beginning of period
$
9,372

 
N/A

Cash, cash equivalents, and restricted cash at beginning of period
N/A

 
$
12,372

Cash and cash equivalents at end of period
$
441,415

 
N/A

Cash, cash equivalents, and restricted cash at end of period
N/A

 
$
441,415


____________________________________________
(1)
Included as a component within the cash paid to repurchase Senior Notes, including premium line item on the accompanying statements of cash flows.
Accounting Standards Update 2017-07 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the three and nine months ended September 30, 2017, are summarized as follows:
 
For the Three Months Ended September 30, 2017
 
For the Nine Months Ended September 30, 2017
 
As Reported
 
As Adjusted
 
As Reported
 
As Adjusted
 
(in thousands)
Operating expenses:
 
 
 
 
 
 
 
Exploration
$
14,243

 
$
14,119

 
$
39,293

 
$
38,919

General and administrative
$
27,880

 
$
27,564

 
$
85,564

 
$
84,618

Total operating expenses
$
380,971

 
$
380,531

 
$
856,475

 
$
855,155

 
 
 
 
 
 
 
 
Income (loss) from operations
$
(85,592
)
 
$
(85,152
)
 
$
(67,637
)
 
$
(66,317
)
 
 
 
 
 
 
 
 
Other non-operating income, net
$
1,301

 
$
861

 
$
2,901

 
$
1,581