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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