Debt - Senior Unsecured Notes Exchangeable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2014
Debt Instrument [Line Items]
Interest expense	$ 94,394,000	$ 89,907,000	$ 79,246,000
Amortization expense of deferred financing costs	$ 4,500,000	$ 4,100,000	3,800,000
Senior unsecured notes - exchangeable | Senior unsecured notes - exchangeable
Debt Instrument [Line Items]
Face amount				$ 250,000,000
Stated interest rate (as a percent)				2.625%
Interest on note			6,100,000
Interest expense			4,100,000
Accretion of debt discount			1,600,000
Amortization expense of deferred financing costs			$ 400,000