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Derivative Instruments and Hedging Activity - Interest Rate Derivatives (Details) - Interest Rate Swap [Member]
Unit_Standard_pure_T33SsbyF2EC9zsHjDPwM6w in Thousands, $ in Thousands
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Interest Rate Derivatives, Number of Instruments 12 10
Interest Rate Derivatives, Notional Amount $ 240,000 $ 258,543