Income Taxes - NOLs (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Operating loss carryforwards |
|
|
|
| Deferred tax liabilities relating to property and equipment, net operating loss and tax credit carryforwards and other temporary differences |
|
$ 52,000
|
|
| Increase in valuation allowance for state net operating loss carryforwards |
|
1,700
|
|
| Reconciliation of differences between income before income tax expense and income subject to income tax expense |
|
|
|
| (Loss) income before income tax (expense) benefit |
$ (238,570)
|
41,391
|
$ 117,943
|
| Non-taxable loss (income) |
224,609
|
(48,861)
|
(117,465)
|
| Loss (income) subject to income tax expense |
(13,961)
|
(7,470)
|
478
|
| Income tax paid |
|
|
|
| Income tax payments during the period |
16,990
|
2,772
|
757
|
| Unrecognized Tax Benefits, Beginning Balance |
148
|
|
|
| Increases for tax positions taken in prior years |
1,572
|
148
|
|
| Decreases for tax positions taken during the current year |
(148)
|
|
|
| Settlements of tax positons taken in prior years |
(139)
|
|
|
| Unrecognized Tax Benefits, Ending Balance |
1,433
|
148
|
|
| Portion of unrecognized tax benefits that would impact the effective tax rate if recognized |
1,400
|
0
|
$ 0
|
| Interest and penalties accrued |
200
|
|
|
| Decrease in Unrecognized Tax Benefits is Reasonably Possible |
$ 400
|
|
|
| Federal |
|
|
|
| Operating loss carryforwards |
|
|
|
| Net operating loss carryforwards |
|
9,600
|
|
| State |
|
|
|
| Operating loss carryforwards |
|
|
|
| Net operating loss carryforwards |
|
$ 24,600
|
|