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Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Tax at statutory rate | $ 22,899 | $ 28,150 | $ 24,432
State taxes, net of federal benefit | 6,450 | 3,548 | 2,010
Effect of U.S. tax reform (the Tax Act) | 0 | 13,074 | 0
Effect of net income (loss) attributable to noncontrolling interests | (171) | (1,017) | (91)
Change in valuation allowance | 4,508 | (2,613) | (5,125)
Other, net | (725) | (652) | (182)
Income tax expense (benefit) | $ 32,961 | $ 40,490 | $ 21,044
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Tax at statutory rate | 21.00% | 35.00% | 35.00%
State taxes, net of federal benefit | 6.00% | 4.00% | 3.00%
Effect of U.S. tax reform (the Tax Act) | 0.00% | 16.00% | 0.00%
Effect of net income (loss) attributable to noncontrolling interests | (0.00%) | (1.00%) | (0.00%)
Change in valuation allowance | 4.00% | (3.00%) | (7.00%)
Other, net | (1.00%) | (1.00%) | (1.00%)
Income tax expense (benefit) | 30.00% | 50.00% | 30.00%

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