Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Percentage of taxable income distributed to the partnership (at least)	100.00%
Net deferred tax liability	$ 166,978	$ 153,819
Gross deferred income tax assets:
Net operating loss carryforwards	77,227	98,054
Basis difference - real estate property	181,254	156,394
Basis difference - intangibles	506	2,225
Other - temporary differences	47,649	31,503
Total gross deferred income tax assets	306,636	288,176
Valuation allowance	(46,302)	(45,628)
Total deferred income tax assets, net of valuation allowance	260,334	242,548
Gross deferred income tax liabilities:
Basis difference - real estate property	315,553	289,867
Basis difference - intangibles	65,921	64,714
Straight-line rent	1,597	5,172
Other - temporary differences	44,241	36,614
Total gross deferred income tax liabilities	427,312	396,367
Net deferred income tax liabilities	$ 166,978	$ 153,819