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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Federal [Abstract] |  |  |
Current | $ (12) | $ 49 | $ 1,367
Deferred | (3,248) | 95,259 | 182,371
Total Federal Tax Expense | (3,260) | 95,308 | 183,738
State [Abstract] |  |  |
Current | (2,118) | (3,099) | (2,433)
Deferred (included in Federal above) | 0 | 0 | 0
Total State Tax Expense | (2,118) | (3,099) | (2,433)
Total | $ (5,378) | 92,209 | 181,305
U.S. Federal statutory rate | 35.00% |  |
Tax benefit at U.S. statutory rate | $ 139,657 | 192,390 | 115,603
Credits | 6,163 | 3,937 | (2,222)
Valuation allowance | (142,862) | (111,797) | 64,155
Goodwill Impairment | (10,789) | (7,856) | 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount | (5,716) | 0 | 0
Non-deductible transaction costs | 0 | 0 | (6,870)
Return to provision | (920) | (72) | 716
State taxes, net of federal income tax | 11,788 | 18,323 | 11,582
Meals and entertainment | (868) | (1,090) | (946)
Other, net | (1,831) | (1,626) | (713)
Deferred income tax assets [Abstract] |  |  |
Operating loss carryforwards | 319,948 | 282,075 |
Accrued expenses | 109,283 | 144,691 |
Prepaid revenue | 2,626 | 2,415 |
Deferred lease liability | 93,358 | 94,105 |
Capital and financing lease obligations | 862,038 | 872,002 |
Tax credits | 49,550 | 40,974 |
Intangible Assets | 20,272 | 22,522 |
Deferred gain on sale leaseback | 4,233 | 5,661 |
Total gross deferred income tax asset | 1,461,308 | 1,464,445 |
Valuation allowance | (264,305) | (121,602) |
Net deferred income tax assets | 1,197,003 | 1,342,843 |
Deferred income tax liabilities [Abstract] |  |  |
Property, plant and equipment | (1,209,595) | (1,320,423) |
Investment in unconsolidated ventures | (66,678) | (88,798) |
Other | (1,376) | (2,673) |
Total gross deferred income tax liability | (1,277,649) | (1,411,894) |
Net deferred tax liability | (80,646) | (69,051) |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 3,248 | (95,261) | (182,371)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 64,200
Tax Credit Carryforward [Line Items] |  |  |
Tax credits, valuation allowance | 46,200 | 32,100 |
Net operating loss, limitation of utilization |  | 92,800 |
Unrecognized tax benefits [Roll Forward] |  |  |
Balance at beginning of period | 30,236 | 30,195 |
Additions for tax positions related to the current year | 0 | 0 |
Additions for tax positions related to prior years | 30 | 50 |
Reductions for tax positions related to prior years | (1,106) | (9) |
Balance at end of period | 29,160 | 30,236 | 30,195
Total interest and penalties reserved |  | 100 |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | 1,033,000 | 930,400 |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards, valuation allowance | 218,100 | 89,500 |
Emeritus [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Net operating loss, limitation of utilization | 53,900 |  |
Federal, State and Local [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) |  |  | $ 94,100
Restricted Stock [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | $ 126,700 | $ 126,700 |

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