Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Document Period End Date	Dec. 31, 2020
Equity Method Investment Board Seats	3
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 7,300
Contributions from noncontrolling interests	400	$ 3,600	$ 5
Liabilities	325,895	325,533
Assets	$ 988,847	875,539
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Percentage of Voting Interest	50.00%
Percentage of Voting Interest	51.00%
Equity Method Investment Board Seats	2
TPG
Variable Interest Entity [Line Items]
Liabilities	$ 125,500	116,800
Assets	$ 131,900	$ 126,800