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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense | Income tax expense consisted of the following (in thousands):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |
Federal | $ | 38,535 |  |  | $ | 237 |  |  | $ | 32,090 |
State | 3,979 |  |  | 2,928 |  |  | 5,665 |
Foreign | 102 |  |  | 534 |  |  | 1,250 |
| 42,616 |  |  | 3,699 |  |  | 39,005 |
Deferred: |  |  |  |  |
Federal | (104,573 | ) |  | 42,895 |  |  | 33,912 |
State | 3,625 |  |  | 1,737 |  |  | 4,530 |
| (100,948 | ) |  | 44,632 |  |  | 38,442 |
Total income tax expense (benefit) | $ | (58,332 | ) |  | $ | 48,331 |  |  | $ | 77,447 |
Schedule of Effective Income Tax Rate Reconciliation | The effective income tax rate differs from the federal corporate tax rate of 35% in 2017, 2016 and 2015 as follows (in thousands):
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Tax at statutory rate | $ | 50,595 |  |  | $ | 44,611 |  |  | $ | 70,406 |
Change in federal income tax rate | (110,508 | ) |  | — |  | — |  | — |
State income taxes, net of federal tax benefits | 4,943 |  |  | 3,032 |  |  | 6,627 |
Non-deductible meals and entertainment | 1,495 |  |  | 1,549 |  |  | 1,687 |
Income tax credits | (1,780 | ) |  | (1,900 | ) |  | (1,700 | )
Equity compensation | (820 | ) |  | — |  | — |  | — |
Other, net | (2,257 | ) |  | 1,039 |  |  | 427 |
Total income tax expense (benefit) | $ | (58,332 | ) |  | $ | 48,331 |  |  | $ | 77,447 |
Schedule of Deferred Tax Assets and Liabilities | At December 31, deferred income tax assets and liabilities consisted of the following (in thousands):
| December 31,
| 2017 |  | 2016
Deferred income tax assets: |  |  |
Insurance and claims accruals | $ | 41,986 |  |  | $ | 74,015 |
Compensation-related accruals | 6,797 |  |  | 10,056 |
Allowance for uncollectible accounts | 3,599 |  |  | 6,135 |
Other | 1,979 |  |  | 4,168 |
Gross deferred income tax assets | 54,361 |  |  | 94,374 |
Deferred income tax liabilities: |  |  |
Property and equipment | 243,482 |  |  | 377,093 |
Prepaid expenses | 4,699 |  |  | 7,737 |
Other | 1,367 |  |  | 2,313 |
Gross deferred income tax liabilities | 249,548 |  |  | 387,143 |
Net deferred income tax liability | $ | 195,187 |  |  | $ | 292,769 |
Reconciliation of Unrecognized Tax Benefits | The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2017 and 2016 are shown below (in thousands).
| December 31,
| 2017 |  | 2016
Unrecognized tax benefits, beginning balance | $ | 6,055 |  |  | $ | 7,717 |
Gross increases – tax positions in prior period | 168 |  |  | 236 |
Gross decreases – tax positions in prior period | — |  |  | (217 | )
Gross increases – current-period tax positions | 136 |  |  | 473 |
Settlements | (3,476 | ) |  | (2,154 | )
Unrecognized tax benefits, ending balance | $ | 2,883 |  |  | $ | 6,055 |

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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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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32840-109319 + Details
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