Derivative Instruments (Details) $ in Thousands	3 Months Ended		24 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2011 USD ($) instrument
Derivative [Line Items]
Amortization of interest expense	$ 343	$ 335
Amount to be recognized from hedged transactions within 12 months, approximate	$ 5,300
4.20% Senior Notes, due December 2021
Derivative [Line Items]
Interest rate on senior notes			4.20%
4.50% Senior Notes, due December 2020
Derivative [Line Items]
Interest rate on senior notes			4.50%
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