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Derivative Instruments and Hedge Activities - Summary of Net Gains (Losses) Recorded in Accumulated Other Comprehensive Income (Loss) and Consolidated Statements of Operations Relating to Cash Flow Derivative Instruments (Details) - Interest Rate Swaps
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Derivative [Line Items]  
Amount of Gain Recognized in OCI (Effective Portion) $ 688
Amount of Loss Reclassified from OCI to Income as an Increase to Interest Expense $ (579)