Other Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 52,437	$ 11,834	$ 12,145	$ 9,156	$ 18,658	$ 27,480	$ 17,916	$ 5,382	$ 85,571	$ 69,436	$ 31,887
Reconciling items to taxable income:
Depreciation and amortization									38,260	30,457	28,332
Gain or loss on disposition of depreciable assets									(32,103)	1,659	(4,940)
Impairments									121	687	0
Straight-line rent									(7,101)	(8,833)	(12,203)
Receivable allowances									2,067	571	2,074
Stock-based compensation									1,301	7,518	2,020
Other									2,236	4,304	1,213
Reconciling items to taxable income, total									4,781	36,363	16,496
Taxable income									90,352	105,799	48,383
Dividends paid									$ 131,759	$ 120,266	$ 116,371