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SELECTED CONSOLIDATED STATEMENTS OF OPERATIONS DATA (Reconciliation of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SELECTED STATEMENTS OF OPERATIONS DATA [Abstract]      
Balance at beginning of year $ 2,166 $ 2,476 $ 3,179
Increase during the year 7,907 1,369 218
Amounts collected (379) (85) (130)
Write-off of bad debts (38) (1,594) (791)
Balance at the end of year $ 9,656 $ 2,166 $ 2,476