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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Taxes |
Schedule of components of provision (benefit) for income taxes |
Years ended December 31, |  | 2016 |  |  | 2015 |  |  | 2014 |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Current (benefit) provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (43,993 | ) |  | $ | (24,727 | ) |  | $ | 119,074 |
State |  |  | (24,479 | ) |  |  | (3,638 | ) |  |  | 19,858 |
Foreign |  |  | 4,567 |  |  |  | 7,898 |  |  |  | 2,907 |
Deferred (benefit) provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (31,505 | ) |  |  | (31,178 | ) |  |  | 11,514 |
State |  |  | (2,704 | ) |  |  | (1,835 | ) |  |  | 840 |
Total income tax (benefit) provision |  | $ | (98,114 | ) |  | $ | (53,480 | ) |  | $ | 154,193 |
Schedule of reconciliation between the federal statutory rate and effective tax rate |
Years ended December 31, |  | 2016 |  |  | 2015 |  |  | 2014 |
Federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes, net of federal benefit |  |  | 1.3 |  |  |  | — |  |  |  | 3.3 |
Tax credits |  |  | 0.1 |  |  |  | 0.3 |  |  |  | (0.7 | )
Non-deductible expenses |  |  | (0.7 | ) |  |  | (1.3 | ) |  |  | 0.4 |
Change in contingencies |  |  | 6.6 |  |  |  | — |  |  |  | — |
Other |  |  | (1.3 | ) |  |  | 0.9 |  |  |  | 0.6 |
Effective tax rate |  |  | 41.0 | % |  |  | 34.9 | % |  |  | 38.6 | %
Schedule of deferred tax assets and liabilities |
December 31, |  | 2016 |  |  | 2015 |
(in thousands) |  |  |  |  |  |  |  |
Deferred tax assets: |  |  |  |  |  |  |  |
Self-insurance |  | $ | 5,907 |  |  | $ | 7,274 |
Pension |  |  | 11,995 |  |  |  | 12,048 |
State net operating loss carryforwards |  |  | 1,455 |  |  |  | 370 |
Bad debt |  |  | 991 |  |  |  | 4,041 |
Accrued payroll |  |  | 857 |  |  |  | 1,330 |
Stock-based compensation |  |  | 5,847 |  |  |  | 5,885 |
All others |  |  | 2,483 |  |  |  | 4,704 |
Valuation allowance |  |  | (356 | ) |  |  | (276 | )
Gross deferred tax assets |  |  | 29,179 |  |  |  | 35,376 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation |  |  | (95,606 | ) |  |  | (137,606 | )
Goodwill amortization |  |  | (9,340 | ) |  |  | (8,887 | )
Basis differences in variable interest entities |  |  | (5,281 | ) |  |  | (4,876 | )
Basis differences in joint ventures |  |  | (396 | ) |  |  | 518 |
All others |  |  | (22 | ) |  |  | (20 | )
Gross deferred tax liabilities |  |  | (110,645 | ) |  |  | (150,871 | )
Net deferred tax liabilities |  | $ | (81,466 | ) |  | $ | (115,495 | )
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits |
|  | 2016 |  |  | 2015 |
Balance at January 1 |  | $ | 26,152,000 |  |  | $ | 23,267,000 |
Additions based on tax positions related to the current year |  |  | 0 |  |  |  | 2,171,000 |
Additions for tax positions of prior years |  |  | 0 |  |  |  | 714,000 |
Reductions for tax positions of prior years |  |  | (23,937,000 | ) |  |  | 0 |
Balance at December 31 |  | $ | 2,215,000 |  |  | $ | 26,152,000 |

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