Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 46,196	$ 52,260
Income taxes paid	1,536	1,534
Cash paid for operating leases	6,487	0
Supplemental Disclosure of Noncash Investing and Financing Activities:
Accrued capital expenditures	5,216	454
Dividend distributions declared, but not paid	68,254	64,571
Issuance of OP Units in HTALP	2,603	0	$ 0
Redemption of noncontrolling interest	1,312	4,907
Redemption of redeemable noncontrolling interest	3,441	0
ROU assets obtained in exchange for lease obligations	$ 200,879	$ 0