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Derivative - Other comprehensive income loss (Details) - Derivatives qualifying as hedges [Member] - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ (196,000) | $ (254,000)
Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ 17,000 | $ (25,000)

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