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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.

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