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General - Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
General and Administrative Expense        
Public Utility, Property, Plant and Equipment [Line Items]        
Depreciation $ 551 $ 416 $ 1,660 $ 1,251