Annual report pursuant to Section 13 and 15(d)

Related Party Transactions (Details)

v2.4.0.8
Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Lease revenue $ 540,165,000 $ 535,822,000 $ 538,993,000
Mack [Member]
     
Related Party Transaction [Line Items]      
Lease revenue 226,000 238,000 253,000
Due from related parties 0 0  
RG [Member]
     
Related Party Transaction [Line Items]      
Related party revenue $ 2,272,000    
Leased Office Space 1 [Member] | Mack [Member]
     
Related Party Transaction [Line Items]      
Area of property (in square feet) 717    
Leased Office Space 2 [Member] | Mack [Member]
     
Related Party Transaction [Line Items]      
Area of property (in square feet) 6,317    
Lease expiration date Nov. 01, 2014    
Leased Property [Member]
     
Related Party Transaction [Line Items]      
Number of real estate properties 1