STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011
Stock-based compensation
Maximum shares of common stock that can be issued under the 2011 plan	1,800,000
Shares available for future grant under the 2011 Plan	1,685,044
Total after-tax share-based compensation cost by type of program
Before-tax share-based compensation expense	$ 1,157,000	$ 805,000
Income tax benefit	(316,000)	(215,000)
After-tax share-based compensation expense	841,000	590,000
Total unrecognized compensation cost related to nonvested share-based compensation	5,100,000	4,300,000
Weighted average recognition period of total unrecognized compensation cost (in years)	1
Total fair value of shares vested	400,000	1,500,000
Restricted and deferred stock units
Total after-tax share-based compensation cost by type of program
Before-tax share-based compensation expense	1,138,000	690,000
Stock Options
Total after-tax share-based compensation cost by type of program
Before-tax share-based compensation expense	$ 19,000	$ 115,000