Organization and Basis of Presentation - Cash, Cash Equivalents and Restricted Cash And Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents-unrestricted	$ 246,204	$ 70,087	$ 38,168	$ 134,465
Cash and cash equivalents-restricted	10,271	11,007	16,803	16,930
Total unrestricted and restricted cash and cash equivalents shown in the condensed consolidated statement of cash flows	$ 256,475	$ 81,094	$ 54,971	$ 151,395