EARNINGS PER SHARE DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Basic [Abstract]
Weighted average shares outstanding (in shares)	14,411	14,315	14,375	14,307
Net income	$ 13,092	$ 8,274	$ 36,915	$ 22,227
Convertible preferred stock dividend	23	23	68	68
Net income attributable to common shareholders	13,069	8,251	36,847	22,159
Per share amount (in dollars per share)	$ 0.91	$ 0.58	$ 2.56	$ 1.55
Diluted [Abstract]
Weighted average shares outstanding (in shares)	14,411	14,315	14,375	14,307
Assumed conversion of convertible preferred stock (in shares)	840	840	840	840
Total dilutive shares (in shares)	15,251	15,155	15,215	15,147
Net income attributable to common shareholders	13,069	8,251	36,847	22,159
Convertible preferred stock dividend	23	23	68	68
Net income for diluted earnings per share	$ 13,092	$ 8,274	$ 36,915	$ 22,227
Per share amount (in dollars per share)	$ 0.86	$ 0.55	$ 2.43	$ 1.47