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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Components of Income Tax Provision | Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2016, 2015 and 2014 are as follows (in thousands):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Federal income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | (24,777 | ) |  | $ | (42,020 | ) |  | $ | 39,438 |
Deferred |  |  | (134,592 | ) |  |  | (83,812 | ) |  |  | 39,673 |
|  |  | (159,369 | ) |  |  | (125,832 | ) |  |  | 79,111 |
State income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (257 | ) |  |  | (3,480 | ) |  |  | 3,987 |
Deferred |  |  | (14,163 | ) |  |  | (12,433 | ) |  |  | 5,292 |
|  |  | (14,420 | ) |  |  | (15,913 | ) |  |  | 9,279 |
Foreign income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (368 | ) |  |  | (2,590 | ) |  |  | 4,521 |
Deferred |  |  | (3,405 | ) |  |  | (3,628 | ) |  |  | (1,292 | )
|  |  | (3,773 | ) |  |  | (6,218 | ) |  |  | 3,229 |
Total income tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | (25,402 | ) |  |  | (48,090 | ) |  |  | 47,946 |
Deferred |  |  | (152,160 | ) |  |  | (99,873 | ) |  |  | 43,673 |
Total income tax expense (benefit): |  | $ | (177,562 | ) |  | $ | (147,963 | ) |  | $ | 91,619 |
Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate | The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2016, 2015 and 2014 is summarized as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Statutory tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State income taxes |  |  | 2.0 |  |  |  | 2.1 |  |  |  | 2.5 |
Permanent differences |  |  | (0.1 | ) |  |  | (1.3 | ) |  |  | (1.4 | )
Other differences, net |  |  | (1.1 | ) |  |  | (2.4 | ) |  |  | (0.1 | )
Effective tax rate |  |  | 35.8 | % |  |  | 33.4 | % |  |  | 36.0 | %
Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities | The tax effect of significant temporary differences representing deferred tax assets and liabilities at December 31, 2016 and 2015 are as follows (in thousands):
|  | 2016 |  |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 4,702 |  |  | $ | 27,887 |
Workers’ compensation allowance |  |  | 25,736 |  |  |  | 28,734 |
Other |  |  | 16,710 |  |  |  | 21,305 |
|  |  | 47,148 |  |  |  | 77,926 |
Non-current: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 198,783 |  |  |  | 77,514 |
AMT credit |  |  | 7,907 |  |  |  | — |
Expense associated with employee stock options |  |  | 14,443 |  |  |  | 14,591 |
Federal benefit of state deferred tax liabilities |  |  | 23,026 |  |  |  | 24,485 |
Other |  |  | 19,137 |  |  |  | 20,441 |
|  |  | 263,296 |  |  |  | 137,031 |
Less: |  |  |  |  |  |  |  |
Allowance to reduce deferred tax asset to expected realizable value |  |  | — |  |  |  | (603 | )
Total deferred tax assets |  |  | 310,444 |  |  |  | 214,354 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |
Other |  |  | (10,709 | ) |  |  | (12,805 | )
Non-current: |  |  |  |  |  |  |  |
Property and equipment basis difference |  |  | (929,483 | ) |  |  | (986,922 | )
Other |  |  | (16,789 | ) |  |  | (13,339 | )
|  |  | (946,272 | ) |  |  | (1,000,261 | )
Total deferred tax liabilities |  |  | (956,981 | ) |  |  | (1,013,066 | )
Net deferred tax liability |  | $ | (646,537 | ) |  | $ | (798,712 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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