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Other Current Assets and Other Assets - Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Current Assets and Other Assets      
Cash surrender value of company owned life insurance $ 3,027   $ 2,918
Non-trade receivables 1,903   1,904
Deposits 1,828   1,698
Surety bond collateral     1,000
Finance lease right-of-use assets 614    
Other 217   246
Total other assets $ 7,589 $ 8,304 $ 7,766