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Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, expense $ 9,600    
U.S federal income tax rate 35.00%    
State income taxes (benefit), net of federal tax benefit $ (776) $ 1,161 $ (322)
State income taxes (benefit), net of federal tax benefit (impact of REIT election), net of valuation allowance 1,500 1,200 900
Valuation allowance (22,577) (17,312)  
Increase in valuation allowance 5,300    
Accumulated undistributed earnings invested 2,600    
Additional taxes (net of foreign tax credits) 100    
Foreign operating losses carry forward 104,600    
State tax credits 5,800    
Deferred tax asset net of valuation allowance 4,200    
Unrecognized tax benefits, net 4,300    
Decrease in unrecognized tax benefits 200    
Recognized tax benefits that will reduce company's tax rate 4,300    
Interest and penalties recognized 100    
Accrued income tax examination penalties and interest   100  
Tax adjustment due to immaterial error correction (17,958) $ (7,904) $ (7,389)
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryforwards 189,700    
Domestic Country      
Operating Loss Carryforwards [Line Items]      
Federal net operating loss carryforwards 42,700    
Restatement Adjustment | Prior Year Misstatement      
Operating Loss Carryforwards [Line Items]      
Tax adjustment due to immaterial error correction $ 2,700