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Reserve for Severance Activity in reserve (Details) - Employee Severance [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Reserve for severance and related payments    
Balance at beginning of period $ 697 $ 311
Charged to earnings 714 993
Cash paid (950) (583)
Balance at end of the period $ 461 $ 721