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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts receivable, allowance for doubtful accounts      
Balance at beginning of year $ 502 $ 512 $ 495
Provision credited to expense 16 63 22
Recoveries, net of write-offs (19) (73) (5)
Balance at end of year $ 499 $ 502 $ 512