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Derivative - Other comprehensive income loss (Details) - Derivatives qualifying as hedges [Member] - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ (298,000) | $ 155,000 | $ (494,000) | $ (99,000)
Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion | $ 19,000 | $ 70,000 | $ 36,000 | $ 45,000

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