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Income Taxes (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]    
Operating loss carryforwards, federal $ 222,861,000  
Operating loss carryforwards, state 19,471,000  
Deferred tax assets, valuation allowance 112,532,000 $ 90,278,000
Deferred Tax Asset, Operating and Capital Loss Carryforwards and Credits 104,862,000 $ 90,871,000
Foreign tax credits, additional paid in capital benefit $ 51,508,000  
Effective Income Tax Rate Reconciliation, Percent (1.00%) 12.00%
Effective tax rate excluding valuation allowance 19.00% 47.00%
Deferred Tax Assets, Deferred Income $ 2,455,000  
Deferred Tax Liabilities, Other 10,587,000  
Federal Deferred Tax Asset, Impact of ASU 2016-09 21,350,000  
Deferred Tax Assets, Gross 112,532,000 $ 100,889,000
Deferred Tax Assets, State Taxes 1,559,000  
Unrecognized tax benefits 808,000  
Deferred Tax Asset, Revaluation 25,261,000  
Domestic Tax Authority [Member]    
Income Taxes [Line Items]    
Net operating losses included in deferred tax assets $ 19,952,000