NET INCOME (LOSS) PER SHARE (Basic and Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic net income (loss) per share:
Net income from continuing operations	$ 28,246	$ 20,144	$ 12,755	$ 13,419	$ 14,980	$ (31,881)	$ 12,020	$ 11,732	$ 74,564	$ 6,851	$ 36,295
Net loss from discontinued operations									0	(10,370)	(2,291)
Net income (loss)	$ 28,246	$ 20,144	$ 12,755	$ 13,419	$ 14,980	$ (31,881)	$ 4,998	$ 8,384	$ 74,564	$ (3,519)	$ 34,004
Weighted average common shares outstanding, basic (in shares)									74,386	68,990	64,864
Basic net income per common share from continuing operations (in dollars per share)	$ 0.38	$ 0.27	$ 0.17	$ 0.18	$ 0.20	$ (0.45)	$ 0.18	$ 0.18	$ 1.00	$ 0.10	$ 0.56
Basic net loss per common share from discontinued operations (in dollars per share)									0.00	(0.15)	(0.04)
Net income (loss) per share - basic (in dollars per share)	$ 0.38	$ 0.27	$ 0.17	$ 0.18	$ 0.20	$ (0.45)	$ 0.08	$ 0.13	$ 1.00	$ (0.05)	$ 0.52
Diluted net income (loss) per share:
Net income from continuing operations	$ 28,246	$ 20,144	$ 12,755	$ 13,419	$ 14,980	$ (31,881)	$ 12,020	$ 11,732	$ 74,564	$ 6,851	$ 36,295
Loss from discontinued operations (net of tax benefit)									0	(10,370)	(2,291)
Net income (loss)	$ 28,246	$ 20,144	$ 12,755	$ 13,419	$ 14,980	$ (31,881)	$ 4,998	$ 8,384	$ 74,564	$ (3,519)	$ 34,004
Weighted average common shares outstanding, basic (in shares)									74,386	68,990	64,864
Effect of dilutive securities:
2016 Convertible notes and related warrants (in shares)									3,462	922	0
Stock options and restricted stock (in shares)									1,346	1,442	1,056
Weighted average common shares for diluted earnings per share (in shares)									79,194	71,354	65,920
Diluted net income per common share from continuing operations (in dollars per share)	$ 0.35	$ 0.25	$ 0.16	$ 0.18	$ 0.20	$ (0.45)	$ 0.18	$ 0.18	$ 0.94	$ 0.10	$ 0.55
Diluted net loss per common share from discontinued operations (in dollars per share)									0.00	(0.15)	(0.03)
Net income (loss) per share - diluted (in dollars per share)	$ 0.35	$ 0.25	$ 0.16	$ 0.18	$ 0.20	$ (0.45)	$ 0.08	$ 0.13	$ 0.94	$ (0.05)	$ 0.52