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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, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Amount	$ 345,500,000	$ 225,000,000
Weighted Average Fixed Pay Interest Rate	2.33%	0.90%
Weighted Average Variable Interest Rate	1.38%	0.75%
Swap Maturity, 2017
Derivative [Line Items]
Notional Amount	$ 0	$ 215,000,000
Weighted Average Fixed Pay Interest Rate	0.00%	0.83%
Weighted Average Variable Interest Rate	0.00%	0.74%
Swap Maturity, 2019
Derivative [Line Items]
Notional Amount	$ 0	$ 10,000,000
Weighted Average Fixed Pay Interest Rate	0.00%	2.25%
Weighted Average Variable Interest Rate	0.00%	0.97%
Swap Maturity, 2024
Derivative [Line Items]
Notional Amount	$ 98,000,000	$ 0
Weighted Average Fixed Pay Interest Rate	2.18%	0.00%
Weighted Average Variable Interest Rate	1.36%	0.00%
Swap Maturity, 2027
Derivative [Line Items]
Notional Amount	$ 247,500,000	$ 0
Weighted Average Fixed Pay Interest Rate	2.39%	0.00%
Weighted Average Variable Interest Rate	1.39%	0.00%
Interest-Only-Strip
Derivative [Line Items]
Notional Amount	$ 0	$ 5,000,000
Weighted Average Fixed Pay Interest Rate	0.00%	1.80%
Weighted Average Variable Interest Rate	0.00%	1.00%
Interest-Only-Strip | Swap Maturity, 2026
Derivative [Line Items]
Notional Amount	$ 0	$ 5,000,000
Weighted Average Fixed Pay Interest Rate	0.00%	1.80%
Weighted Average Variable Interest Rate	0.00%	1.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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+ References

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