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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets - interest rate swaps | $ 1,592 | $ 1,409
Derivative liabilities - interest rate swaps | 242 | 1,994
Interest rate swaps [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets - interest rate swaps | 1,592 | 1,409
Derivative liabilities - interest rate swaps | $ 242 | $ 1,994

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