SIGNIFICANT ACCOUNTING POLICIES Cash Flow, Supplemental Cash Equivalents Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 8,094	$ 25,813
Restricted cash and cash equivalents	735,954	742,093
Total cash, cash equivalents and restricted cash presented in the condensed consolidated statements of cash flows	$ 744,048	$ 767,906	$ 739,655	$ 703,231