Segment Information - Reconciliation of Segment Income to Income before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting [Abstract]
Segment income	$ 152,954	$ 131,234	$ 279,503	$ 233,375
Interest and other debt expense	26,406	25,837	53,712	50,807
Income before income taxes	$ 126,548	$ 105,397	$ 225,791	$ 182,568