NET EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Earnings (Numerator) [Abstract]
Basic EPS - Net earnings	$ 8,894	$ 10,888
Diluted EPS - Net earnings	$ 8,894	$ 10,888
Number of Shares (Denominator) [Abstract]
Basic EPS - Weighted average common shares outstanding (in shares)	30,146,705	29,316,452
Effect of dilutive securities - stock options and restricted stock (in shares)	932,299	1,305,281
Diluted EPS - Weighted average common shares outstanding and effect of stock options and restricted stock (in shares)	31,079,004	30,621,733
Per Share Amount [Abstract]
Basic EPS - Net earnings (in dollars per share)	$ 0.30	$ 0.37
Diluted EPS - Net earnings (in dollars per share)	$ 0.29	$ 0.36
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)	11,500	65,000