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EARNINGS PER SHARE DATA (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Basic [Abstract]                              
Weighted average shares outstanding (in shares)                         14,374 14,301 13,821
Net income (loss) $ 14,100 $ 13,100 $ 12,200 $ 11,600 $ 9,200 $ 8,300 $ 7,600 $ 6,300 $ 5,900 $ 5,300 $ 4,600 $ 3,600 $ 50,985 $ 31,437 $ 19,381
Convertible preferred stock dividend                         (90) (90) (90)
Net income attributable to common shareholders                         50,895 31,347 19,291
Per share amount (in dollars per share) $ 0.98 $ 0.91 $ 0.84 $ 0.81 $ 0.64 $ 0.58 $ 0.53 $ 0.44 $ 0.41 $ 0.38 $ 0.33 $ 0.27 $ 3.54 $ 2.19 $ 1.40
Diluted [Abstract]                              
Weighted average shares outstanding (in shares)                         14,374 14,301 13,821
Net effect of dilutive stock options from treasury stock method (in shares)                         0 0 7
Assumed conversion of convertible notes (in shares)                         0 0 153
Assumed conversion of convertible preferred stock (in shares)                         840 840 840
Total dilutive shares (in shares)                         15,214 15,141 14,821
Net income attributable to common shareholders                         50,895 31,347 19,291
Interest on convertible notes, net of income taxes                         0 0 142
Convertible preferred stock dividend                         90 90 90
Net income for diluted earnings per share                         $ 50,985 $ 31,437 $ 19,523
Per share amount (in dollars per share) $ 0.92 $ 0.86 $ 0.80 $ 0.77 $ 0.61 $ 0.55 $ 0.50 $ 0.42 $ 0.39 $ 0.36 $ 0.31 $ 0.26 $ 3.35 $ 2.08 $ 1.32