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Notes Payable (Details) (USD $) | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 2023 Notes | Apr. 30, 2013 2023 Notes | Sep. 30, 2014 2024 Notes | May 31, 2014 2024 Notes instrument | May 31, 2014 Forward Contracts instrument | Dec. 31, 2013 Forward Contracts instrument | Apr. 30, 2013 Forward Contracts instrument | Apr. 30, 2013 Forward Contracts 2023 Notes | May 31, 2014 Forward Contracts 2024 Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  |  |  | $ 350,000,000 |  | $ 350,000,000 |  |  |  |  |
Stated interest rate |  |  |  |  | 3.30% |  | 3.90% |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | 347,406,000 |  | 349,293,000 |  |  |  |  |  |
Notes payable, unamortized discount | 10,599,000 |  | 10,816,000 |  | 2,594,000 |  | 707,000 |  |  |  |  |
Effective Interest Rate |  |  |  |  | 3.388% |  | 3.924% |  |  |  |  |
Number of interest rate derivatives held |  |  |  |  |  |  | 3 | 3 | 4 | 4 |  |
Derivative, Notional Amount |  |  |  |  |  |  | 225,000,000 | 225,000,000 | 240,000,000 | 240,000,000 |  |
Interest rate cash flow hedge liability, fair value |  |  |  |  |  |  |  |  |  | 3,156,000 | 3,156,000 |
Amount of cash flow hedge reported in AOCI |  |  |  |  |  |  |  | 6,312,000 |  | 3,141,000 | 3,141,000 | 6,312,000
Proceeds from notes payable | 349,293,000 | 347,406,000 |  | 344,266,000 |  | 346,068,000 |  |  |  |  |  |
Debt Issuance Cost |  |  |  | $ 3,140,000 |  | $ 3,225,000 |  |  |  |  |  |

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