STOCK COMPENSATION PLANS (Restricted Stock Units activity) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Performance Units and Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested shares at beginning of year (in shares)	763,386	765,143	389,681
Shares granted (in shares)	890,252	753,612	895,803
Shares vested (in shares)	(958,750)	(666,856)	(520,341)
Shares forfeited (in shares)	(42,704)	(88,513)	0
Nonvested shares at end of year (in shares)	652,184	763,386	765,143
Nonvested shares at beginning of year, weighted average grant date value (in dollars per share)	$ 11.47	$ 11.73	$ 14.96
Shares granted, weighted average grant date value (in dollars per share)	$ 15.18	$ 11.78	$ 10.90
Shares vested, weighted average grant date value (in dollars per share)	$ 13.40	$ 12.08	$ 12.71
Shares forfeited, weighted average grant date value (in dollars per share)	$ 12.51	$ 11.81	$ 0
Nonvested shares at end of year, weighted average grant date value (in dollars per share)	$ 13.64	$ 11.47	$ 11.73
Fair value of shares issued	$ 5,441,944	$ 0	$ 0
Unrecognized compensation expense at end of year	10,663,208	10,725,573	0
Weighted average remaining vesting period (in years)	1.63	1.65	0
Weighted average grant date fair value	13,514,025.36	8,877,549.36	9,764,252.7
Closing trading price of company stock (in dollars per share)	$ 16.35
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested shares at beginning of year (in shares)	149,779	64,667	32,750
Shares granted (in shares)	267,750	169,000	66,000
Shares vested (in shares)	(123,413)	(75,708)	(33,083)
Shares forfeited (in shares)	(4,906)	(8,180)	(1,000)
Nonvested shares at end of year (in shares)	289,210	149,779	64,667
Nonvested shares at beginning of year, weighted average grant date value (in dollars per share)	$ 11.53	$ 11.41	$ 12.79
Shares granted, weighted average grant date value (in dollars per share)	$ 14.51	$ 11.65	$ 10.94
Shares vested, weighted average grant date value (in dollars per share)	$ 12.76	$ 11.73	$ 11.85
Shares forfeited, weighted average grant date value (in dollars per share)	$ 11.58	$ 11.14	$ 10.91
Nonvested shares at end of year, weighted average grant date value (in dollars per share)	$ 13.77	$ 11.53	$ 11.41
Fair value of shares issued	671,162	0	0
Unrecognized compensation expense at end of year	4,728,581	2,104,393	0
Weighted average remaining vesting period (in years)	2.55	2.14
Weighted average grant date fair value	$ 3,885,052.5	$ 1,968,850	$ 722,040