Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

	Years Ended December 31,
	2014		2013		2012
Numerator:
Net income	$	119,198	$	123,170	$	111,830
Denominator:
Denominator for basic earnings per share -
weighted average shares		38,705		39,650		40,337
Effect of dilutive securities:
Employee stock options and restricted units		425		586		654
Denominator for diluted earnings per share -
Adjusted weighted average shares and the effect of dilutive
securities		39,130		40,236		40,991
Net income per share:
Net income per share - basic	$	3.08	$	3.11	$	2.77
Net income per share - diluted	$	3.05	$	3.06	$	2.73