Supplemental Disclosure of Cash Flow Information - Cash and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 452,441	$ 240,227
Restricted cash	28,397	26,856
Long-term restricted cash	41,292	34,614
Total cash, cash equivalents, and restricted cash shown in the consolidated statements of cash flows	$ 522,130	$ 301,697	$ 324,959	$ 450,218