STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		1 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012 item	Aug. 31, 2011 Maximum	Dec. 31, 2013 Restricted common stock	Dec. 31, 2012 Restricted common stock	Dec. 31, 2011 Restricted common stock	Dec. 31, 2010 Restricted common stock	Dec. 31, 2013 Common stock, excluding unvested restricted stock	Dec. 31, 2012 Common stock, excluding unvested restricted stock	Dec. 31, 2011 Common stock, excluding unvested restricted stock	Dec. 31, 2010 Common stock, excluding unvested restricted stock
Stockholders' equity
Preferred stock, authorized (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, authorized (in shares)	200,000,000	200,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	41,886,915	41,684,960
Common stock, outstanding (in shares)	41,883,193	41,681,238
Number of voting rights entitled per share of common stock owned	1	1
Outstanding shares								41,768,526	41,553,178	41,191,468	40,730,753
Unvested common stock (in shares)				114,667	128,060	425,311	727,725
Repurchase of equity interest			$ 2,000
Shares held in treasury	3,722	3,722
Cost of treasury stock	$ 57	$ 57