Derivative Instruments and Hedging Activities - Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCI into earnings	$ 525	$ (125)	$ (250)
Amount of Gain or (Loss) Reclassified from AOCI into earnings	0	0	0
Amount expected to be reclassified from AOCI into earnings	0	$ 0	$ 0
Interest Rate Swap \| Interest expense \| Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCI into earnings	$ 9

Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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