Other - (Reconciliation of Cash and Cash Equivalents and Restricted Cash and Cash Equivalents Reported Within Balance Sheet and Cash Flows) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 55,232	$ 9,288	$ 231,128
Restricted cash and cash equivalents			24,320
Cash, cash equivalents, restricted cash and cash equivalents	$ 55,232	$ 9,288	$ 255,448	$ 27,699