Organization and Basis of Presentation - Cash, Cash Equivalents and Restricted Cash And Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents-unrestricted	$ 103,442	$ 73,629	$ 271,877	$ 70,087
Cash and cash equivalents-restricted	9,918	10,412	10,470	11,007
Total unrestricted and restricted cash and cash equivalents shown in the condensed consolidated statement of cash flows	$ 113,360	$ 84,041	$ 282,347	$ 81,094