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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Available-for-sale securities |  | $ 20,512
Liabilities: |  |
Interest rate swaps | $ 1,421 | 2,226
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Available-for-sale securities |  | 20,512
Liabilities: |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-sale securities |  | 0
Liabilities: |  |
Interest rate swaps | 1,421 | 2,226
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available-for-sale securities |  | 0
Liabilities: |  |
Interest rate swaps | $ 0 | $ 0

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