Equity and Financing Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Aug. 27, 2021	Jun. 15, 2021
Common Stock [Abstract]
Common stock issued during period			1,500,000
Common stock issued during period under the stock plan	0	0
Issuance of common stock, net		$ 0	$ 79,635
Dilutive Shares Calculation [Abstract]
Shares included in diluted earnings per share		13,021
Debt Issuance, 2.48% due 2031 | Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Face amount				$ 60,000
Interest rate				2.48%
Term		10 years
Debt Issuance, 2.63% due 2033 | Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Face amount					$ 40,000
Interest rate					2.63%
Term		12 years