ACQUISITION - Summary of Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Total Revenues
As reported	$ 337,830	$ 176,792	$ 805,989	$ 500,739
Pro forma		334,760	1,012,209	1,007,495
Operating Income
As reported	(29,432)	8,536	(51,021)	26,245
Pro forma		24,353	(43,867)	54,458
Net income (loss) applicable to common shareholders
As reported	(49,329)	2,421	(131,982)	(928)
Pro forma		$ 3,315	$ (146,837)	$ (5,816)
Net income (loss) per share applicable to common shareholders
Basic, as reported (in dollars per share)	$ (2.95)	$ 0.17	$ (8.49)	$ (0.06)
Basic, pro forma (in dollars per share)		$ 0.23	$ (9.44)	$ (0.40)
Diluted, as reported (in dollars per share)	$ (2.95)	$ 0.16	$ (8.49)	$ (0.06)
Diluted, pro forma (in dollars per share)		$ 0.22	$ (9.44)	$ (0.40)