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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
Valuation and Qualifying Accounts      
Balance at beginning of year $ 317 $ 371 $ 729
Charged to cost and expenses 240 51 (230)
Deduction (106) (105) (128)
Balance at end of year $ 451 $ 317 $ 371