Organization and Basis of Presentation - Cash, Cash Equivalents and Restricted Cash And Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents-unrestricted	$ 48,155	$ 73,629	$ 246,204	$ 70,087
Cash and cash equivalents-restricted	10,021	10,412	10,271	11,007
Total unrestricted and restricted cash and cash equivalents shown in the condensed consolidated statement of cash flows	$ 58,176	$ 84,041	$ 256,475	$ 81,094