Disposed Properties (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2014 Properties	Sep. 30, 2013 Properties	May 08, 2014 Non Core [Member]	Sep. 30, 2014 Non Core [Member] Properties	Sep. 30, 2014 Non Core [Member] Triple Net 30 Pack Jan 8 2014 [Member] sqft	Sep. 30, 2014 Non Core [Member] Triple Net 28 Pack Feb 21 2014 [Member] sqft	Sep. 30, 2014 Non Core [Member] Triple Net 151 Pack Mar 10 2014 [Member] sqft	Sep. 30, 2014 Non Core [Member] Sanofi Aventis Bridgewater, NJ [Member] sqft	Sep. 30, 2014 Non Core [Member] Triple Net Portfolio - 4 Properties [Member] sqft	Sep. 30, 2014 Non Core [Member] Triple Net 9 Pack May 8 [Member] sqft	Sep. 30, 2014 Non Core [Member] Triple Net Portfolio - 223 Properties Sold YTD 2014 [Member]	Sep. 17, 2014 Select Service Lodging Properties Held for Sale - 52 Properties [Member] Properties	Sep. 30, 2013 Net Lease Properties Held for Sale [Member] Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Real Estate Properties	203	268										52	225
Summary of disposition activity
Disposal date			May 08, 2014		Jan. 08, 2014	Feb. 21, 2014	Mar. 10, 2014	Mar. 21, 2014	Mar. 28, 2014	May 08, 2014
Gross disposition price	$ 1,476,500	$ 1,815,900			$ 55,300	$ 451,900	$ 278,600	$ 226,400	$ 58,500	$ 138,200	$ 1,208,900
Area of Real Estate Property					148,233	7,496,769	815,008	736,572	1,118,096	599,830
Number Of Disposed Assets	249	304		236
Number Of Surrendered Properties	1	1