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SELECTED STATEMENTS OF OPERATIONS DATA (Reconciliation of Allowance for Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SELECTED STATEMENTS OF OPERATIONS DATA [Abstract]      
Balance at beginning of year $ 3,602 $ 3,525 $ 5,450
Increase during the year 808 986 1,657
Amounts collected (235) (222) (420)
Write-off of bad debts (996) (687) (3,162)
Balance at the end of year $ 3,179 $ 3,602 $ 3,525