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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income Before (Benefit) Provision For Income Taxes | Income before (benefit) provision for income taxes consisted of the following:
(in thousands) |  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
U.S. |  | $ | 83,525 |  |  | $ | 67,199 |  |  | $ | 66,889 |
Foreign |  |  | (73 | ) |  |  | (268 | ) |  |  | (512 | )
|  | $ | 83,452 |  |  | $ | 66,931 |  |  | $ | 66,377 |
(Benefit) Provision for Income Taxes | The (benefit) provision for income taxes consisted of the following:
(in thousands) |  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal |  | $ | 21,171 |  |  | $ | 17,203 |  |  | $ | 7,976 |
State |  |  | 2,976 |  |  |  | 2,049 |  |  |  | 1,851 |
Foreign |  |  | 2,016 |  |  |  | 1,683 |  |  |  | 1,645 |
|  |  | 26,163 |  |  |  | 20,935 |  |  |  | 11,472 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal |  |  | (103,518 | ) |  |  | 4,005 |  |  |  | 13,201 |
State |  |  | 6,948 |  |  |  | 3,039 |  |  |  | 1,538 |
Foreign |  |  | (61 | ) |  |  | 701 |  |  |  | (304 | )
|  |  | (96,631 | ) |  |  | 7,745 |  |  |  | 14,435 |
Total |  | $ | (70,468 | ) |  | $ | 28,680 |  |  | $ | 25,907 |
Reconciliation of U.S. Federal Statutory Tax Rate to Company's Effective Tax Rate | The reconciliation of the U.S. federal statutory tax rate to the Company’s effective tax rate is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
U.S. federal statutory rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal benefit |  |  | 4.1 |  |  |  | 4.2 |  |  |  | 4.2 |
State deferred tax rate change, net of federal benefit |  |  | 0.5 |  |  |  | 2.0 |  |  |  | (0.4 | )
Valuation allowance |  |  | 0.1 |  |  |  | 1.1 |  |  |  | — |
Share-based compensation |  |  | (1.0 | ) |  |  | — |  |  |  | — |
Enactment of the Tax Cuts and Jobs Act |  |  | (122.9 | ) |  |  | — |  |  |  | — |
Other |  |  | (0.2 | ) |  |  | 0.6 |  |  |  | 0.2 |
|  |  | (84.4 | )% |  |  | 42.9 | % |  |  | 39.0 | %
Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities | The following table shows the deferred income taxes related to the temporary differences between the tax bases of assets and liabilities and the respective amounts included in “Deferred income taxes, net” on the Company’s Consolidated Balance Sheets:
(in thousands) |  | December 31, |
|  | 2017 |  |  | 2016 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Accelerated depreciation |  | $ | 195,694 |  |  | $ | 293,141 |
Prepaid costs currently deductible |  |  | 4,152 |  |  |  | 6,572 |
Other |  |  | 4,405 |  |  |  | 5,747 |
Total deferred tax liabilities |  |  | 204,251 |  |  |  | 305,460 |
Deferred tax assets: |  |  |  |  |  |  |  |
Accrued costs not yet deductible |  |  | 7,880 |  |  |  | 9,785 |
Allowance for doubtful accounts |  |  | 484 |  |  |  | 809 |
Deferred revenues |  |  | 213 |  |  |  | 965 |
Share-based compensation |  |  | 1,045 |  |  |  | 1,882 |
Total deferred tax assets, net of valuation allowance of $0.8 million in 2017 and $0.7 million in 2016 |  |  | 9,622 |  |  |  | 13,441 |
Deferred income taxes, net |  | $ | 194,629 |  |  | $ | 292,019 |

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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=84230637&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=84230637&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=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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