EARNINGS PER SHARE (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Earnings Per Share [Abstract]

Schedule of (Loss) Earnings Per Share

Earnings per share is computed as follows (in thousands, except per share data):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2013						2012						2013						2012
	Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount
Basic earnings per share	$	120,199		89,610	$	1.34	$	92,257		82,461	$	1.12	$	63,985		86,867	$	0.74	$	86,243		82,480	$	1.05
Effect of dilutive incentive-based awards				596						913						664						821
Diluted earnings per share	$	120,199		90,206	$	1.33	$	92,257		83,374	$	1.11	$	63,985		87,531	$	0.73	$	86,243		83,301	$	1.04

Earnings per share is computed as follows (in thousands, except per share data):

	Year Ended December 31, 2012						Year Ended December 31, 2011						Year Ended December 31, 2010
	Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount
Basic earnings per share	$	77,444		82,480	$	0.94	$	19,113		81,392	$	0.23	$	(45,464)		80,800	$	(0.56	)
Effect of dilutive incentive-based time vested unit awards				1,072						632						—
Diluted earnings per share	$	77,444		83,552	$	0.93	$	19,113		82,024	$	0.23	$	(45,464)		80,800	$	(0.56	)