Other Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net income	$ 39,185	$ 69,771	$ 23,092
Reconciling items to taxable income
Depreciation and amortization	67,953	64,775	46,426
Gain or loss on disposition of depreciable assets	(15,689)	(27,581)	1,570
Straight-line rent	(11,535)	(3,049)	(4,551)
Receivable allowances	1,942	2,470	1,680
Share-based compensation	2,628	(1,699)	1,855
Other	12,631	842	6,552
Reconciling items to taxable income, total	57,930	35,758	53,532
Taxable income	97,115	105,529	76,624
Dividends paid	$ 155,358	$ 150,266	$ 142,327