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Derivative Instruments and Hedging Activities - Interest Rate Swaps (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Interest rate swaps - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 395,500,000	$ 345,500,000
Weighted Average Fixed Interest Rate	2.43%	2.33%
Weighted Average Variable Interest Rate	2.35%	1.38%
2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 98,000,000	$ 98,000,000
Weighted Average Fixed Interest Rate	2.18%	2.18%
Weighted Average Variable Interest Rate	2.35%	1.36%
2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 247,500,000	$ 247,500,000
Weighted Average Fixed Interest Rate	2.39%	2.39%
Weighted Average Variable Interest Rate	2.35%	1.39%
2028
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	$ 50,000,000	$ 0
Weighted Average Fixed Interest Rate	3.13%	0.00%
Weighted Average Variable Interest Rate	2.32%	0.00%

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ 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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- Definition

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+ References

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- Definition

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