BUSINESS ACQUISITIONS (Pro Forma Financial Information Summarization Results of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Business Combinations [Abstract]
Total Revenue	$ 206,048	$ 608,375
Net income	$ 9,416	$ 17,690
Net income per share
Basic (in dollars per share)	$ 0.33	$ 0.61
Diluted (in dollars per share)	$ 0.32	$ 0.59