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Income Taxes and Deferred Tax Asset/Liability - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets related to: |  |
Accrued compensation and other | $ 3,707 | $ 3,417
Goodwill | 0 | 1,133
Noncontrolling interests | 1,687 | 1,648
Deferred revenue | 232 | 312
Revaluation of put/call liabilities | 11,570 | 11,269
Net operating loss carryforwards | 22,818 | 26,015
Total deferred tax assets | 40,014 | 43,794
Valuation allowance for deferred tax assets | (31,718) | (36,545)
Net deferred tax assets | 8,296 | 7,249
Liabilities related to: |  |
Depreciation of property and equipment | (7,709) | (6,661)
Amortization of tax basis goodwill | (1,450) | 0
Other | (587) | (588)
Net deferred tax liabilities | (9,746) | (7,249)
Net total deferred tax liabilities | $ (1,450) | $ 0

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