EARNINGS (LOSS) PER SHARE (Antidilutive securities excluded from the computation of earnings (loss) per share) (Details) - shares	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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)	886,000	1,124,000	979,000	1,903,000	1,681,000	1,176,000	1,207,000	1,274,000	556,000	1,680,739	1,914,021
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)									350,000	803,999	997,802
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)									0	119,940	115,869
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)									206,000	756,800	800,350