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Income Taxes | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Income Taxes | INCOME TAXES Income tax expense consisted of the following (in thousands):
| Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Current: |  |  |  |  |
Federal | $ | 237 |  |  | $ | 32,090 |  |  | $ | 51,260 |
State | 2,928 |  |  | 5,665 |  |  | 6,606 |
Foreign | 534 |  |  | 1,250 |  |  | 220 |
| 3,699 |  |  | 39,005 |  |  | 58,086 |
Deferred: |  |  |  |  |
Federal | 42,895 |  |  | 33,912 |  |  | 4,503 |
State | 1,737 |  |  | 4,530 |  |  | 535 |
| 44,632 |  |  | 38,442 |  |  | 5,038 |
Total income tax expense | $ | 48,331 |  |  | $ | 77,447 |  |  | $ | 63,124 |
The effective income tax rate differs from the federal corporate tax rate of 35% in 2016, 2015 and 2014 as follows (in thousands):
| Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Tax at statutory rate | $ | 44,611 |  |  | $ | 70,406 |  |  | $ | 56,621 |
State income taxes, net of federal tax benefits | 3,032 |  |  | 6,627 |  |  | 4,641 |
Non-deductible meals and entertainment | 1,549 |  |  | 1,687 |  |  | 1,497 |
Income tax credits | (1,900 | ) |  | (1,700 | ) |  | (1,600 | )
Other, net | 1,039 |  |  | 427 |  |  | 1,965 |
Total income tax expense | $ | 48,331 |  |  | $ | 77,447 |  |  | $ | 63,124 |
At December 31, deferred tax assets and liabilities consisted of the following (in thousands):
| December 31,
| 2016 |  | 2015
Deferred tax assets: |  |  |
Insurance and claims accruals | $ | 74,015 |  |  | $ | 71,285 |
Compensation-related accruals | 10,056 |  |  | 10,187 |
Allowance for uncollectible accounts | 6,135 |  |  | 6,138 |
Other | 4,168 |  |  | 6,291 |
Gross deferred tax assets | 94,374 |  |  | 93,901 |
Deferred tax liabilities: |  |  |
Property and equipment | 377,093 |  |  | 330,580 |
Prepaid expenses | 7,737 |  |  | 7,229 |
Other | 2,313 |  |  | 2,356 |
Gross deferred tax liabilities | 387,143 |  |  | 340,165 |
Net deferred tax liability | $ | 292,769 |  |  | $ | 246,264 |
Deferred tax assets are more likely than not to be realized as a result of historical profitability, future taxable income, and reversal of deferred tax liabilities. We recognized a $1.1 million decrease in the net liability for unrecognized tax benefits for the year ended December 31, 2016 and a $0.6 million decrease for the year ended December 31, 2015. We accrued interest expense of $0.2 million during 2016 and $0.2 million during 2015, excluding from both years the reversal of accrued interest related to the adjustment of uncertain tax positions. If recognized, $3.9 million of unrecognized tax benefits as of December 31, 2016 and $5.0 million as of December 31, 2015 would impact our effective tax rate. Interest of $1.1 million as of December 31, 2016 and $1.4 million as of December 31, 2015 has been reflected as a component of the total liability. We expect no other significant increases or decreases for uncertain tax positions during the next twelve months. The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2016 and 2015 are shown below (in thousands).
| December 31,
| 2016 |  | 2015
Unrecognized tax benefits, beginning balance | $ | 7,717 |  |  | $ | 8,583 |
Gross increases – tax positions in prior period | 236 |  |  | 229 |
Gross decreases – tax positions in prior period | (217 | ) |  | — |
Gross increases – current-period tax positions | 473 |  |  | 769 |
Settlements | (2,154 | ) |  | (1,864 | )
Unrecognized tax benefits, ending balance | $ | 6,055 |  |  | $ | 7,717 |
We file U.S. federal income tax returns, as well as income tax returns in various states and several foreign jurisdictions. The years 2013 through 2015 are open for examination by the U.S. Internal Revenue Service (“IRS”), and various years are open for examination by state and foreign tax authorities. In fourth quarter 2016, the IRS completed its audit of our amended 2011 federal income tax return with no additional taxes or penalties due. State and foreign jurisdictional statutes of limitations generally range from three to four years.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: 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 Reference 5: 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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