NET EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Earnings (Numerator) [Abstract]
Basic EPS - Net earnings	$ 11,886	$ 15,172
Diluted EPS - Net earnings	$ 11,886	$ 15,172
Number of Shares (Denominator) [Abstract]
Basic EPS - Weighted average common shares outstanding (in shares)	31,406,792	30,842,208
Effect of dilutive securities - stock options and restricted stock (in shares)	410,256	616,096
Diluted EPS - Weighted average common shares outstanding and effect of stock options and restricted stock (in shares)	31,817,048	31,458,304
Per Share Amount [Abstract]
Basic EPS - Net earnings (in dollars per share)	$ 0.38	$ 0.49
Diluted EPS - Net earnings (in dollars per share)	$ 0.37	$ 0.48
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)	208,872	399,868