EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Options Assigned (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Unexercised Inception to Date (in shares)	10,572,094
Options Granted in 2004 to 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Unexercised Inception to Date (in shares)	90,560
Options Granted in 2004 to 2007 [Member] | Lower Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of Grant	2004
Strike Price (in dollars per share)	$ 29.92
Options Granted in 2004 to 2007 [Member] | Upper Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of Grant	2007
Strike Price (in dollars per share)	$ 33.80
Options Granted in 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of Grant	2012
Total Unexercised Inception to Date (in shares)	600,000
Options Granted in 2012 [Member] | Lower Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike Price (in dollars per share)	$ 6.82
Options Granted in 2012 [Member] | Upper Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike Price (in dollars per share)	$ 7.34
Options Granted in 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of Grant	2013
Total Unexercised Inception to Date (in shares)	1,100,497
Options Granted in 2013 [Member] | Lower Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike Price (in dollars per share)	$ 10.24
Options Granted in 2013 [Member] | Upper Range [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Strike Price (in dollars per share)	$ 11.48
Options Granted in 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Date of Grant	2014
Strike Price (in dollars per share)	$ 12.20
Total Unexercised Inception to Date (in shares)	258,750
Options Assigned [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Unexercised Inception to Date (in shares)	2,049,807