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Debt (Revolver and Term Loans) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Debt        
Outstanding borrowings $ 1,025,000,000   $ 1,025,000,000  
Interest expense 7,492,000 3,584,000 21,764,000 8,532,000
Revolver
        
Debt        
Outstanding borrowings 0 [1]   0 [1]  
Interest expense 287,000 268,000 906,000 885,000
Unused commitment fee 300,000 300,000 800,000 800,000
Unsecured Term Loan Due August 27, 2018
        
Debt        
Outstanding borrowings 400,000,000 [2]   400,000,000 [2]  
Interest rate (as a percent) 3.07% [2],[3]   3.07% [2],[3]  
Interest expense 3,137,000 914,000 9,090,000 914,000
Unsecured Term Loan Maturity Date March 20, 2019
        
Debt        
Outstanding borrowings 400,000,000   400,000,000  
Interest rate (as a percent) 1.71% [3]   1.71% [3]  
Interest expense 1,748,000 1,329,000 4,898,000 4,137,000
Seven-Year Term Loan
        
Debt        
Outstanding borrowings 225,000,000 [2]   225,000,000 [2]  
Interest rate (as a percent) 4.04% [2],[3]   4.04% [2],[3]  
Interest expense 2,320,000 1,073,000 6,870,000 2,596,000
Interest Rate Contract | Unsecured Term Loan Due August 27, 2018
        
Debt        
Interest expense 1,300,000   3,800,000  
Interest Rate Contract | Seven-Year Term Loan
        
Debt        
Interest expense $ 1,000,000   $ 3,100,000  
[1] .
[2] Includes interest expense related to an interest rate hedge of $1.3 million and $3.8 million for the three and nine months ended September 30, 2014, respectively, and $0.3 million and $0.3 million for the three and nine months ended September 30, 2013, respectively.
[3] Interest rate at September 30, 2014 gives effect to interest rate hedges and LIBOR floors, as applicable.