Derivative Instruments (Details) $ in Thousands		3 Months Ended		24 Months Ended
	May 27, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2011 USD ($) instrument	Dec. 31, 2020	Apr. 29, 2020	Dec. 09, 2011
Derivative [Line Items]
Amortization of interest expense		$ 366	$ 343
4.20% Senior Notes, due December 2021
Derivative [Line Items]
Interest rate on senior notes		4.20%
Senior Notes | 4.20% Senior Notes, due December 2021
Derivative [Line Items]
Interest rate on senior notes		4.20%			4.20%		4.20%
Pre-tax amount included in Accumulated other comprehensive income (loss)		$ 2,400
Senior Notes | 4.5% Senior Notes
Derivative [Line Items]
Interest rate on senior notes	4.50%	4.50%				4.50%
Amount to be recognized from hedged transactions within 12 months, approximate	$ 1,400
Interest Rate Contract
Derivative [Line Items]
Number of instruments held | instrument				2
Interest Rate Exchange Agreement Expiring 2010 and 2011
Derivative [Line Items]
Amortization of interest expense				$ 68,900
Term of amortized interest expense, years				10 years