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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]      
Purchase of treasury stock (in shares) 3,316,000 187,000  
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock $ 166,000 $ 211,000 $ 261,000