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Reserve for Severance Activity in reserve (Details) - Employee Severance [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Reserve for severance and related payments    
Balance at beginning of period $ 697 $ 311
Charged to earnings 347 621
Cash paid (677) (504)
Balance at end of the period $ 367 $ 428