EARNINGS (LOSS) PER SHARE (Antidilutive securities excluded from the computation of earnings (loss) per share) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)	1,681,000	1,176,000	1,207,000	1,274,000	1,914,000	2,191,000	1,972,000	1,725,000	1,680,739	1,914,021	2,367,566
Unvested restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)									803,999	997,802	1,028,916
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)									119,940	115,869	100,000
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents and outstanding stock options excluded from the calculation of diluted earnings (loss) per share (in thousands)									756,800	800,350	1,238,650