SHARE-BASED COMPENSATION Stock-Based Compensation - SARs (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding	616,803	556,803
Sars Outstanding Weighted Average Exercise Price	$ 20.71	$ 19.08
Granted		138,181
SARS Granted Weighted Average Exercise Price		$ 24.54
Exercised	(27,389)	(49,366)
Sars Exercised Weighted Average Exercise Price	$ 15.87	$ 12.55
Forfeitures	(30,512)	(28,815)
Sars Forfeited Weighted Average Exercise Price	$ 27.41	$ 19.35
Outstanding	558,902	616,803
Sars Outstanding Weighted Average Exercise Price	$ 20.58	$ 20.71
SARs Exercisable	423,815	308,799
SARs Exercisable Weighted Average Exercise Price	$ 19.61	$ 20.90