SIGNIFICANT ACCOUNTING POLICIES Cash Flow, Supplemental Cash Equivalents Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents	$ 7,318	$ 25,813
Restricted cash and cash equivalents	731,292	742,093
Total cash, cash equivalents and restricted cash presented in the condensed consolidated statements of cash flows	$ 738,610	$ 767,906	$ 760,842	$ 703,231