SHARE-BASED COMPENSATION - Restricted Stock Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Time-based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at the beginning of year	128,279	100,616	0
Granted (in shares)	51,465	55,870	105,616
Vested (in shares)	(43,514)	(26,865)	0
Forfeited / Canceled (in shares)	(16,911)	(1,342)	(5,000)
Unvested shares at the end of year	119,319	128,279	100,616
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value at the beginning of year	$ 34.30	$ 28.70	$ 0.00
Granted (in dollars per share)	$ 72.45	$ 42.08	$ 29.04
Vested (in dollars per share)	$ 35.68	$ 29.33	$ 0.00
Forfeited / Canceled (in dollars per share)	$ 46.64	$ 37.32	$ 35.98
Weighted Average Grant Date Fair Value at end of year	$ 48.50	$ 34.30	$ 28.70
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested shares at the beginning of year	372,499	266,236	526,220
Granted (in shares)	98,018	184,192	0
Vested (in shares)	(121,794)	(47,120)	(500)
Forfeited / Canceled (in shares)	(133,007)	(30,809)	(259,484)
Unvested shares at the end of year	215,716	372,499	266,236
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Grant Date Fair Value at the beginning of year	$ 29.20	$ 11.29	$ 11.29
Granted (in dollars per share)	$ 72.46	$ 52.71	$ 0.00
Vested (in dollars per share)	$ 40.75	$ 29.20	$ 10.85
Forfeited / Canceled (in dollars per share)	$ 43.89	$ 14.93	$ 11.29
Weighted Average Grant Date Fair Value at end of year	$ 60.76	$ 29.20	$ 11.29