CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]
Purchase of treasury stock (in shares)			618,000
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock	$ 341,000	$ 248,000	$ 338,000