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NET EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	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, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings (Numerator) [Abstract]
Basic EPS - Net earnings									$ 38,765	$ 33,277	$ 26,785
Diluted EPS - Net earnings									$ 38,765	$ 33,277	$ 26,785
Number of Shares (Denominator) [Abstract]
Basic EPS - Weighted average common shares outstanding (in shares)									28,574,623	27,964,348	27,420,091
Effect of dilutive securities - stock options and restricted stock (in shares)									1,669,837	1,656,317	1,454,303
Diluted EPS - Weighted average common shares outstanding (in shares)									30,244,460	29,620,665	28,874,394
Per Share Amount [Abstract]
Basic EPS - Net earnings (in dollars per share)	$ 0.33	$ 0.38	$ 0.34	$ 0.31	$ 0.33	$ 0.30	$ 0.30	$ 0.25	$ 1.36	$ 1.19	$ 0.98
Diluted EPS - Net earnings (in dollars per share)	$ 0.31	$ 0.36	$ 0.32	$ 0.30	$ 0.31	$ 0.29	$ 0.28	$ 0.24	$ 1.28	$ 1.12	$ 0.93
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding, excluded from diluted earnings per share calculation (in shares)									15,400	288,000	338,400