Net Earnings Per Share Net Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Net Earnings Per Share

The following table sets forth the reconciliation of the numerator and denominator utilized in the computation of basic and diluted earnings per share (in thousands):

	Three Months Ended March 31,
	2018		2017
Numerator for earnings per share:
Net earnings for basic and diluted earnings per share	$	39,195	$	42,571
Denominator for earnings per share:
Weighted average number of common shares outstanding	138,504		136,359
Assumed exercise of stock options and vesting of restricted stock awards, net of shares assumed reacquired under the treasury stock method	2,490		1,880
Diluted shares outstanding	140,994		138,239