Fair Value of Assets and Liabilities (Nonrecurring Fair Value Measurements) (Details) - Level 3 - Fair Value, Nonrecurring - Investment in JV/LP - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Realized investment gains (losses) net	$ (75,000)	$ 0	$ (75,000)	$ 0
Carrying value after measurement as of period end	$ 60,456		$ 60,456		$ 0