SHARE-BASED COMPENSATION (Details) (USD $)	0 Months Ended		12 Months Ended
	Jun. 21, 2010	Jun. 18, 2010	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Option valuation assumptions for options granted
Cash received for all stock option exercises			$ 52,995		$ 99,844
Stock options
STOCK-BASED COMPENSATION
Number of stock option plans			3
Number of common shares authorized to be purchased			3,250,000
Vesting rights percentage			33.33%
Expiration term			10 years
Options
Outstanding at beginning of period (in shares)			2,347,456
Granted (in shares)	426,709		942,474
Exercised (in shares)			(9,166)
Forfeited (in shares)			(142,000)
Expired (in shares)			(4,444)
Outstanding at end of period (in shares)			3,134,320	2,347,456
Exercisable at end of period (in shares)			1,636,581
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)			$ 12.13
Granted (in dollars per share)	$ 11.15		$ 8.81
Exercised (in dollars per share)			$ 5.78
Forfeited (in dollars per share)			$ 8.77
Expired (in dollars per share)			$ 19.32
Outstanding at end of period (in dollars per share)			$ 11.29	$ 12.13
Exercisable at end of period (in dollars per share)			$ 12.94
Weighted Average Remaining Contractual Term
Outstanding at end of period			6 years 8 months 12 days
Exercisable at end of period			4 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding at end of period (in dollars)			3,523,257
Exercisable at end of period (in dollars)			1,207,171
Stock Option Exchange Program
Stock options tendered and accepted for cancellation in approved exchange offer (in shares)		454,319
Tendered options as a percentage of total stock options eligible for exchange		95.00%
Granted (in shares)	426,709		942,474
Granted (in dollars per share)	$ 11.15		$ 8.81
Nonvested Shares
Nonvested at the beginning of the period (in shares)			1,115,127
Granted (in shares)	426,709		942,474
Vested (in shares)			(413,418)
Forfeited (in shares)			(146,444)
Nonvested at the end of the period (in shares)			1,497,739	1,115,127
Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)			$ 12.16
Granted (in dollars per share)			$ 8.81
Vested (in dollars per share)			$ 12.94
Forfeited (in dollars per share)			$ 8.77
Nonvested at the end of the period (in dollars per share)			$ 9.49	$ 12.16
Unrecognized costs
Unrecognized costs related to all share-based awards outstanding			1,200,000
Weighted average period for recognition of unrecognized compensation costs			4 years 9 months 18 days
Option valuation assumptions for options granted
Expected volatility (as a percent)			56.10%	56.10%	42.90%
Weighted average risk free rate (as a percent)			0.40%	0.70%	1.20%
Weighted average grant date fair value per share of options granted (in dollars per share)			$ 3.43	$ 3.89	$ 2.13
Total intrinsic value of options exercised			41,240		64,253
Cash received for all stock option exercises			52,995		95,372
Tax benefit realized for tax return deductions			$ 13,816		$ 4,472
Stock options | Directors' Plan
Option valuation assumptions for options granted
Expected life			9 years 6 months	9 years 6 months	9 years 6 months
Stock options | Executive Plan
Option valuation assumptions for options granted
Expected life			3 years 1 month 6 days	3 years 1 month 6 days	3 years 1 month 6 days
Stock options | Employee Plan
Option valuation assumptions for options granted
Expected life			3 years 1 month 6 days	3 years 1 month 6 days	3 years 1 month 6 days