Earnings per Share (Schedule of Earnings per Share, Basic and Diluted) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Weighted average common shares outstanding, used in computing basic earnings per share	67,837	69,614	69,759
Effect of dilutive stock options and restricted stock units	656	787	694
Weighted-average common shares outstanding, used in computing diluted earnings per share	68,493	70,401	70,453
Basic	$ 4.87	$ 3.85	$ 1.51
Diluted	$ 4.83	$ 3.81	$ 1.49