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Reserve for Severance Activity in reserve (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Reserve for severance and related payments    
Balance at beginning of period $ 483 $ 1,710
Charged to earnings 692 456
Cash paid (532) (1,213)
Balance at end of the period $ 643 $ 953