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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate | The following is a reconciliation of our effective tax rate to the federal statutory tax rate:
| Years Ended December 31, |  |
| 2018 |  |  | 2017 |  |  | 2016 |  |
U.S. federal statutory rate |  | 21.0 |  | % |  | 34.9 |  | % |  | 35.0 |  | %
Federal tax law changes |  | 0.5 |  |  |  | (112.2 | ) |  |  | - |  |
State taxes, net of federal benefit |  | 3.7 |  |  |  | 2.8 |  |  |  | 2.7 |  |
Federal and state incentives |  | (0.9 | ) |  |  | (7.0 | ) |  |  | (0.4 | ) |
State law changes |  | - |  |  |  | 2.0 |  |  |  | 0.4 |  |
Permanent differences |  | 0.6 |  |  |  | 0.2 |  |  |  | 1.0 |  |
Net effective rate |  | 24.9 |  | % |  | (79.3 | ) | % |  | 38.7 |  | %
Summary of Provision for Income Taxes | The following is a summary of our provision for income taxes (in thousands):
| Years Ended December 31, |
| 2018 |  |  | 2017 |  |  | 2016 |
Current |  |  |  |  |  |  |  |  |  |  |
Federal | $ | (13,750 | ) |  | $ | (10,426 | ) |  | $ | 21,527 |
State and local |  | 1,740 |  |  |  | 1,542 |  |  |  | 3,053 |
Foreign |  | (234 | ) |  |  | 59 |  |  |  | 108 |
|  | (12,244 | ) |  |  | (8,825 | ) |  |  | 24,688 |
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  | 36,968 |  |  |  | (46,922 | ) |  |  | 10,867 |
State and local |  | 4,134 |  |  |  | 2,667 |  |  |  | 890 |
Foreign |  | 206 |  |  |  | (3 | ) |  |  | (64 | )
|  | 41,308 |  |  |  | (44,258 | ) |  |  | 11,693 |
Total provision | $ | 29,064 |  |  | $ | (53,083 | ) |  | $ | 36,381 |
Summary of Deferred Tax Assets and Liabilities | The following is a summary of our deferred tax assets and liabilities (in thousands)
| December 31, |
| 2018 |  |  | 2017 |
Accrued compensation |  | 10,538 |  |  |  | 9,441 |
Other reserves |  | 8,568 |  |  |  | 6,736 |
Tax credit carryforwards |  | 5,062 |  |  |  | 3,411 |
Operating loss carryforwards |  | 6,914 |  |  |  | 1,388 |
Total gross deferred income taxes |  | 31,082 |  |  |  | 20,976 |
Valuation allowances |  | (3,128 | ) |  |  | (1,681 | )
Total deferred tax assets |  | 27,954 |  |  |  | 19,295 |
Prepaids |  | (5,409 | ) |  |  | (3,587 | )
Other receivables |  | (1,588 | ) |  |  | (2,462 | )
Property and equipment |  | (119,716 | ) |  |  | (79,224 | )
Goodwill |  | (55,118 | ) |  |  | (55,117 | )
Total deferred tax liabilities |  | (181,831 | ) |  |  | (140,390 | )
Total deferred taxes | $ | (153,877 | ) |  | $ | (121,095 | )
Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):
| 2018 |  |  | 2017 |
Gross unrecognized tax benefits - beginning of the year | $ | 3,827 |  |  | $ | 1,832 |
Gross (decreases) increases related to prior year tax positions |  | (397 | ) |  |  | 1,830 |
Gross increases related to current year tax positions |  | 959 |  |  |  | 290 |
Lapse of applicable statute of limitations |  | (495 | ) |  |  | (125 | )
Gross unrecognized tax benefits - end of year | $ | 3,894 |  |  | $ | 3,827 |

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