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Income Taxes and Deferred Tax Asset/Liability - Summary Reconciliation Reported Amount of Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Tax expense (benefit) at the U.S. federal statutory rate | $ 6,568 | $ 5,577 | $ (2,563) |
State tax based on income, net of refunds and federal benefits | 364 | (264) | (113) |
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners | (4,097) | (5,504) | (3,786) |
Valuation allowance | (1,013) | (18,006) | 6,919 |
Tax credits | (286) | (349) | (1,258) |
Tax rate change | (281) | 19,545 | 0 | $ 19,300
Return to provision | 21 | (62) | 400 |
Earn-out liability | 0 | 460 | 433 |
Equity compensation | 26 | (1,371) | 0 |
Other permanent differences | 436 | 92 | 56 |
Total tax expense | $ 1,738 | $ 118 | $ 88 |
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
Tax expense (benefit) at the U.S. federal statutory rate | 21.00% | 35.00% | 35.00% |
State tax based on income, net of refunds and federal benefits | 1.20% | (1.70%) | 1.50% |
Taxes on subsidiaries’ and joint ventures’ earnings allocated to noncontrolling interests owners | (13.10%) | (34.50%) | 51.70% |
Valuation allowance | (3.30%) | (113.00%) | (94.50%) |
Tax credits | (0.90%) | (2.20%) | 17.20% |
Tax rate change | (0.90%) | 122.70% | 0.00% |
Return to provision | 0.10% | (0.40%) | (5.50%) |
Earn-out liability | 0.00% | 2.90% | (5.90%) |
Equity compensation | 0.10% | (8.60%) | 0.00% |
Other permanent differences | 1.40% | 0.60% | (0.80%) |
Effective income rate, percent | 5.60% | 0.80% | (1.30%) |

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