CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Supplemental Cash Flow - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental cash flow information
Interest paid	$ 27,733	$ 15,854
Income taxes paid	0	0
Supplemental disclosure of cash and cash equivalents and restricted cash
Cash and cash equivalents	17,380	12,808
Restricted cash	4,766	703
Total cash and cash equivalents and restricted cash reported in the statements of cash flows	$ 22,146	$ 13,511