Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 52,260	$ 31,175
Income taxes paid	1,534	825
Supplemental Disclosure of Noncash Investing and Financing Activities:
Accrued capital expenditures	454	2,919
Debt assumed and entered into in connection with an acquisition	0	286,000
Dividend distributions declared, but not paid	64,571	61,492
Issuance of operating partnership units in HTALP in connection with an acquisition	0	610
Note receivable retired in connection with an acquisition	0	2,494
Redemption of noncontrolling interest	$ 4,907	$ 5,532