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Derivative Instruments and Hedging Activities Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative [Line Items] |  |
Unrealized gain (loss) on derivative instruments | $ (2,469) | $ 4,529
Designated as Hedging Instrument | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Unrealized gain (loss) on derivative instruments | $ (2,469) | $ 4,529

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