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Segment Information (Geographic Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue
Total revenues	$ 803,987us-gaap_Revenues	$ 779,035us-gaap_Revenues	$ 751,254us-gaap_Revenues	$ 741,470us-gaap_Revenues	$ 733,185us-gaap_Revenues	$ 711,249us-gaap_Revenues	$ 684,109us-gaap_Revenues	$ 682,909us-gaap_Revenues	$ 3,075,746us-gaap_Revenues	$ 2,811,452us-gaap_Revenues	$ 2,469,615us-gaap_Revenues
Net real estate property:
Net real estate property	18,985,559us-gaap_RealEstateInvestmentPropertyNet				18,075,586us-gaap_RealEstateInvestmentPropertyNet				18,985,559us-gaap_RealEstateInvestmentPropertyNet	18,075,586us-gaap_RealEstateInvestmentPropertyNet
United States
Revenue
Total revenues									2,935,524	2,718,234	2,373,646
Net real estate property:
Net real estate property	17,547,255				17,705,962				17,547,255	17,705,962
Canada
Revenue
Total revenues									126,435	93,218	95,969
Net real estate property:
Net real estate property	1,269,710				369,624				1,269,710	369,624
United Kingdom
Revenue
Total revenues									13,787	0	0
Net real estate property:
Net real estate property	$ 168,594				$ 0				$ 168,594	$ 0