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Earnings per Share (Schedule of Earnings per Share, Basic and Diluted) (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Weighted Average Number of Shares Outstanding, Basic	66,327	66,135	66,345	66,553
Effect of dilutive stock options and restricted stock units	460	0	513	0
Weighted Average Number of Shares Outstanding, Diluted, Total	66,787	66,135	66,858	66,553
Earnings Per Share, Basic	$ 0.61	$ (0.77)	$ 1.46	$ (0.76)
Earnings Per Share, Diluted	$ 0.61	$ (0.77)	$ 1.44	$ (0.76)

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