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SCHEDULE II - VALUATION RESERVES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]      
Balance at beginning of year $ 4,527 $ 5,706 $ 5,287
Provision for Doubtful Accounts 224 1,414 536
Valuation Allowances and Reserves, Deductions (1,407) (2,593) (117)
Balance at end of year $ 3,344 $ 4,527 $ 5,706