Fair Value Accounting and Measurement Equity securities without readily determinable values (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Equity Securities	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 13,425	$ 0	$ 0
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	$ 0	$ 13,425	$ 0	$ 13,425