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Income Taxes - Components (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Current:        
U.S. federal $ 0 $ 813 $ 0 $ 813
State and local 0 110 11 110
Provision for income taxes $ 0 $ 923 $ 11 $ 923