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Income Taxes and Distributions (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance      
Beginning amount $ 96,838 $ 98,966 $ 85,207
Expense (benefit) 30,445 (2,128) 13,759
Ending amount $ 127,283 $ 96,838 $ 98,966