NET EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Earnings (Numerator) [Abstract]
Basic EPS - Net earnings	$ 9,732	$ 11,582	$ 18,626	$ 22,470
Diluted EPS - Net earnings	$ 9,732	$ 11,582	$ 18,626	$ 22,470
Number of Shares (Denominator) [Abstract]
Basic EPS - Weighted average common shares outstanding (in shares)	30,280,366	29,505,151	30,213,536	29,410,802
Effect of dilutive securities - stock options and restricted stock (in shares)	869,413	1,280,234	898,153	1,289,759
Diluted EPS - Weighted average common shares outstanding and effect of stock options and restricted stock (in shares)	31,149,779	30,785,385	31,111,689	30,700,561
Per Share Amount [Abstract]
Basic EPS - Net earnings (in dollars per share)	$ 0.32	$ 0.39	$ 0.62	$ 0.76
Diluted EPS - Net earnings (in dollars per share)	$ 0.31	$ 0.38	$ 0.60	$ 0.73
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)			154,476	161,286