Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Disclosure of Cash Flow Information:
Interest paid	$ 101,165	$ 64,988	$ 50,883
Income taxes paid	1,645	1,333	1,059
Supplemental Disclosure of Noncash Investing and Financing Activities:
Accrued capital expenditures	9,878	3,155	5,092
Debt and interest rate swaps assumed and entered into in connection with an acquisition	0	286,000	28,163
Dividend distributions declared, but not paid	65,034	63,823	43,867
Issuance of OP Units in HTALP in connection with an acquisition	0	1,125	71,754
Note receivable included in the consideration of a disposition	0	0	12,737
Note receivable retired in connection with an acquisition	0	8,611	0
Redeemable noncontrolling interest assumed in connection with an acquisition	0	0	4,773
Redemption of noncontrolling interest	$ 5,195	$ 5,943	$ 5,709