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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Current $ 0 $ 0 $ 0 $ 0  
Deferred (437) (514) 3,047 (1,831)  
Income tax (expense) benefit (437) $ (514) 3,047 $ (1,831)  
Net deferred tax assets $ 47,833   $ 47,833   $ 38,301