SHARE-BASED COMPENSATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based compensation
Number of shares authorized	2,200,000
Restricted Stock Awards
Restricted stock activity
Outstanding at the beginning of the period (in shares)	1,281,480
Granted (in shares)	313,550	394,900	334,700
Vested (in shares)	(149,620)
Forfeited (in shares)	(1,950)
Outstanding at the end of the period (in shares)	1,443,460	1,281,480
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 27.71	$ 14.55	$ 22.49
Other disclosure
Fair value of stock vested	$ 1,800,000	$ 4,300,000	$ 3,900,000
Unrecognized compensation cost	15,400,000
Weighted-average period of recognition of unrecognized compensation cost	3 years
Stock Options
Stock options activity
Outstanding at the beginning of the period (in shares)	240,425
Exercised (in shares)	(99,195)
Forfeited (in shares)	(105,500)
Outstanding at the end of the period (in shares)	35,730	240,425
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 27.40
Exercised (in dollars per share)	$ 29.10
Forfeited (in dollars per share)	$ 25.23
Outstanding at the end of the period (in dollars per share)	$ 29.10	$ 27.40
Weighted-Average Remaining Contractual Term
Options outstanding	0 years 1 month 6 days
Intrinsic Value
Options outstanding (in dollars)	164,000
Additional activity related to Company's stock option program
Intrinsic value of options exercised	330,000	0	79,000
Cash proceeds of options exercised	2,785,000	0	763,000
Tax benefit of options exercised	$ 109,000	$ 0	$ 30,000