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General - Depreciation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
General and Administrative Expense        
Public Utility, Property, Plant and Equipment [Line Items]        
Depreciation $ 572 $ 579 $ 1,150 $ 1,106