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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount |  | $ 6,200 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00% |
Current |  |  |  |
Federal |  | $ (651) | $ 0 | $ (1,310)
State |  | 799 | 783 | 2,022
Foreign |  | 4,100 | 3,328 | 7,371
Total current |  | 4,248 | 4,111 | 8,083
Deferred |  |  |  |
Federal |  | 686 | 0 | 191
State |  | (648) | (610) | (1,613)
Foreign |  | (3,086) | (1,198) | 1,043
Total deferred |  | (3,048) | (1,808) | (379)
Provision (benefit) for income taxes |  | 1,200 | 2,303 | 7,704
Effective Income Tax Rate Reconciliation Detail [Table] |  |  |  |
Income tax provision (benefit) computed at statutory federal income tax rates |  | (21,344) | (82,982) | (70,617)
State income taxes (net of federal benefit) |  | 1,664 | (2,960) | (608)
Nondeductible expenses |  | 472 | 419 | 909
Impact of international operations |  | 10,860 | 7,567 | (1,880)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 54,092 | 0 | 0
Goodwill impairments |  | 0 | 12,990 | 20,412
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount |  | 5,151 | 2,247 | 1,411
Valuation allowance |  | (55,850) | 58,846 | 55,392
Other |  | 6,155 | 6,176 | 2,685
Provision (benefit) for income taxes |  | 1,200 | 2,303 | 7,704
Domestic and Foreign Income Before Tax Detail [Table] |  |  |  |
Domestic |  | (46,356) | (235,394) | (195,815)
International |  | (14,627) | (1,696) | (5,948)
Total |  | (60,983) | (237,090) | (201,763)
Unrecognized Tax Benefit Liability Rollforward Detail [Table] |  |  |  |
Gross unrecognized tax benefits at beginning of period |  | 1,593 | 1,955 | 1,959
Decreases in tax positions for prior years |  | 0 | 0 | 0
Increases in tax positions for current year |  | 0 | 16 | 120
Lapse in statute of limitations |  | (327) | (378) | (124)
Gross unrecognized tax benefits at end of period | $ 1,266 | 1,266 | 1,593 | 1,955
Recognized interest and penalties |  | (200) | (100) | 300
Accrued potential interest and penalties | 2,000 | 2,000 | 2,300 |
Amount of unrecognized tax benefits that would affect effective tax rate | 3,100 | 3,100 | 3,200 |
Deferred tax assets: |  |  |  |
Net operating losses | 88,025 | 88,025 | 126,141 |
Foreign tax credits and alternative minimum tax credits | 19,346 | 19,346 | 28,929 |
Accruals | 24,577 | 24,577 | 31,835 |
Deferred Tax Assets, Tax Credit Carryforwards, Amortization for book in excess of tax expense | 40,979 | 40,979 | 67,183 |
All other | 3,813 | 3,813 | 8,932 |
Total deferred tax assets | 176,740 | 176,740 | 263,020 |
Valuation allowance | (130,453) | (130,453) | (185,275) |
Net deferred tax assets | 46,287 | 46,287 | 77,745 |
Deferred tax liabilities: |  |  |  |
Excess book over tax basis in property, plant, and equipment | 48,618 | 48,618 | 83,311 |
All other | 2,064 | 2,064 | 1,702 |
Total deferred tax liability | 50,682 | 50,682 | 85,013 |
Net deferred tax liability | 4,395 | 4,395 | 7,268 |
Increase (decrease) in valuation allowance |  | (54,800) | 58,600 | $ 53,000
Foreign and state net operating loss carryforwards | 62,300 | 62,300 |  |
Operating Loss Carryforwards | 12,800 | 12,800 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 12,900 | 12,900 |  |
Foreign tax credits | 19,100 | $ 19,100 |  |
Tax Adjustments, Settlements, and Unusual Provisions | $ 4,500 |  | $ 49,600 |

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