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Derivative Instruments and Hedging Activities - Interest Rate Swaps (Details) - Cash Flow Hedging - Designated as Hedging Instrument - Interest rate swaps - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional Amount	$ 495,500,000	$ 495,500,000
Weighted Average Fixed Pay Interest Rate	2.60%	2.60%
Weighted Average Variable Interest Rate	1.95%	2.52%
Swap Maturity, 2024
Derivative [Line Items]
Notional Amount	$ 98,000,000	$ 98,000,000
Weighted Average Fixed Pay Interest Rate	2.18%	2.18%
Weighted Average Variable Interest Rate	1.98%	2.45%
Swap Maturity, 2027
Derivative [Line Items]
Notional Amount	$ 247,500,000	$ 247,500,000
Weighted Average Fixed Pay Interest Rate	2.39%	2.39%
Weighted Average Variable Interest Rate	1.94%	2.53%
Swap Maturity, 2028
Derivative [Line Items]
Notional Amount	$ 150,000,000	$ 150,000,000
Weighted Average Fixed Pay Interest Rate	3.23%	3.23%
Weighted Average Variable Interest Rate	1.92%	2.53%

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Average fixed interest rate related to the group of interest rate derivatives.

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- Definition

Average variable interest rate related to the group of interest rate derivatives.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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