Supplemental Cash Flow Information - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 783,542	$ 144,232	$ 120,117
Restricted cash	106,557	40,425	26,535
Cash, cash equivalents and restricted cash	$ 890,099	$ 184,657	$ 146,652	$ 139,846