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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Operating loss carryforwards, federal $ 147,770,000    
Operating loss carryforwards, state 32,821,000    
Deferred tax assets, valuation allowance 102,627,000 $ 75,179,000  
Federal NOL annual utilization limit 14,100,000    
Net operating losses, unrecognized excess tax benefits, federal 1,928,000    
Net operating losses, unrecognized excess tax benefits, state 37,771,000    
Capital loss carryovers 3,423,000    
Deferred Tax Asset, Operating and Capital Loss Carryforwards and Credits 83,323,000 71,494,000  
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 1,319,000 1,917,000 $ 2,713,000
Foreign tax credits, additional paid in capital benefit 52,224,000    
Foreign tax credits utilized for financial statement purposes $ 20,313,000    
Tax Benefit From Reversal of the Net Deferred Tax Liability   $ 1,735,000  
Effective Income Tax Rate Reconciliation, Percent 50.00% 3.00% 6.00%
Effective tax rate excluding valuation allowance (28.00%) (33.00%)  
Unrecognized tax benefits $ 1,355,000 $ 2,127,000  
unrecognized tax benefits primarily associated with state taxes 85,000    
Domestic Tax Authority [Member]      
Income Taxes [Line Items]      
Net operating losses included in deferred tax assets 0    
State and Local Jurisdiction [Member]      
Income Taxes [Line Items]      
Net operating losses included in deferred tax assets 441,000    
Capital Loss Carryforward Related to Business Acquisition [Member] | Internal Revenue Service (IRS) [Member]      
Income Taxes [Line Items]      
Operating Loss Carryforwards $ 29,318,000