Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 318,720	$ 374,289
Restricted cash	82,086	77,563
Total cash, cash equivalents and restricted cash	400,806	451,852	$ 204,078	$ 202,101
Restricted cash held to repay outstanding principal balance of Convertible Notes	69,900
Joint venture cash and cash equivalents
Cash and cash equivalents	141,957	163,448
Cash and cash equivalents available for general corporate purposes
Cash and cash equivalents	$ 176,763	$ 210,841