Segment Operating Results - Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total Assets	$ 3,802,657	$ 3,370,888	$ 2,598,613
United States [Member]
Segment Reporting Information [Line Items]
Total Assets	3,199,435	2,862,343
Europe And Other [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 603,222	$ 508,545