Long-Term Debt (Details)
|
May 04, 2018 |
Nov. 30, 2017
USD ($)
|
Dec. 28, 2016
redetermination
|
Jun. 30, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
| Revolving Credit Facility | Line of Credit |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Borrowing base |
|
|
|
$ 800,000,000
|
|
| Elected commitments |
|
|
|
600,000,000
|
|
| Line of credit, term |
5 years
|
|
|
|
|
| Borrowings, outstanding amount |
|
|
|
30,000,000
|
|
| Remaining borrowing capacity, net of current borrowings outstanding |
|
|
|
569,100,000
|
|
| Maximum borrowing base |
|
|
|
1,500,000,000
|
|
| Number of optional borrowing base redeterminations | redetermination |
|
|
2
|
|
|
| Letter of Credit | Line of Credit |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Letters of credit outstanding |
|
|
|
900,000
|
|
| Minimum | Revolving Credit Facility | Line of Credit |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Debt instrument, covenant, minimum current ratio |
|
|
1
|
|
|
| Maximum | Revolving Credit Facility | Line of Credit |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Debt instrument, covenant, maximum leverage ratio |
|
|
4
|
|
|
| Senior Notes Due 2026 | Senior Notes |
|
|
|
|
|
| Debt Instrument [Line Items] |
|
|
|
|
|
| Long-term debt |
|
$ 400,000,000
|
|
|
|
| Interest rate, stated percentage |
|
5.375%
|
|
|
|
| Proceeds from borrowings, net of issuance costs |
|
$ 391,000,000
|
|
|
|
| Debt issuance costs |
|
$ 9,000,000
|
|
|
|
| Percentage of principal amount, eligible to be redeemed |
|
35.00%
|
|
|
|
| Percentage of principal amount, redeemable |
|
65.00%
|
|
|
|
| Percentage of principal amount, change in control |
|
101.00%
|
|
|
|
| Percentage of principal amount, event of default |
|
25.00%
|
|
|
|
| Debt issuance costs netted to Senior Notes |
|
|
|
$ 8,800,000
|
$ 9,200,000
|
| Debt Instrument, Redemption, Period One | Senior Notes Due 2026 | Senior Notes |
|
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
|
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| Redemption price percentage |
|
105.375%
|
|
|
|
| Debt Instrument, Redemption, Period Two | Senior Notes Due 2026 | Senior Notes |
|
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
|
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| Redemption price percentage |
|
102.688%
|
|
|
|
| Debt Instrument, Redemption, Period Three | Senior Notes Due 2026 | Senior Notes |
|
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
|
|
| Redemption price percentage |
|
101.344%
|
|
|
|
| Debt Instrument, Redemption, Period Four | Senior Notes Due 2026 | Senior Notes |
|
|
|
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| Debt Instrument [Line Items] |
|
|
|
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| Redemption price percentage |
|
100.00%
|
|
|
|