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SCHEDULE II - VALUATION RESERVES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]      
Balance at beginning of year $ 3,344 $ 4,527 $ 5,706
Provision for Doubtful Accounts (362) 224 1,414
Valuation Allowances and Reserves, Deductions (8) (1,407) (2,593)
Balance at end of year $ 2,974 $ 3,344 $ 4,527