NET EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Earnings (Numerator) [Abstract]
Basic EPS - Net earnings	$ 15,178	$ 11,657	$ 33,804	$ 34,127
Diluted EPS - Net earnings	$ 15,178	$ 11,657	$ 33,804	$ 34,127
Number of Shares (Denominator) [Abstract]
Basic EPS - Weighted average common shares outstanding (in shares)	30,463,188	29,708,370	30,296,753	29,509,991
Effect of dilutive securities - stock options and restricted stock (in shares)	783,090	1,215,240	839,437	1,268,110
Diluted EPS - Weighted average common shares outstanding and effect of stock options and restricted stock (in shares)	31,246,278	30,923,610	31,136,190	30,778,101
Per Share Amount [Abstract]
Basic EPS - Net earnings (in dollars per share)	$ 0.50	$ 0.39	$ 1.12	$ 1.16
Diluted EPS - Net earnings (in dollars per share)	$ 0.49	$ 0.38	$ 1.09	$ 1.11
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)			184,976	8,800