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Income Taxes and Deferred Tax Asset/Liability - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets related to: |  |
Accrued compensation and other | $ 3,417 | $ 4,490
Goodwill | 1,133 | 3,909
Noncontrolling interests | 1,648 | 2,085
Deferred revenue | 312 | 482
Revaluation of put/call liabilities | 11,269 | 16,620
Net operating loss carryforwards | 26,015 | 41,942
Total deferred tax assets | 43,794 | 69,528
Valuation allowance for deferred tax assets | (36,545) | (58,034)
Net deferred tax assets | 7,249 | 11,494
Liabilities related to: |  |
Depreciation of property and equipment | (6,661) | (11,471)
Other | (588) | (23)
Net deferred tax liabilities | (7,249) | (11,494)
Net total deferred tax assets | $ 0 | $ 0

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