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Derivative Instruments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest rate contracts |  |  |
Effects of derivative instruments |  |  |
Amount of loss recognized in the income statement as an increase in interest expense | $ 25,000 | $ 0 | $ 500,000
Cash Flow Hedging |  |  |
Effects of derivative instruments |  |  |
Amount of loss recognized in the income statement as an increase in interest expense | 25,000 |  | (499,000)
Cash Flow Hedging | Interest rate contracts | Interest expense Member |  |  |
Effects of derivative instruments |  |  |
Amount of loss recognized in the income statement as an increase in interest expense | $ 25,000 |  | $ (499,000)

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