Derivatives and Hedging Activities - Outstanding Derivatives (Details)	Mar. 31, 2018 USD ($) derivative_instrument	Mar. 31, 2018 EUR (€) derivative_instrument
Interest rate swaps
Derivative [Line Items]
Number of instruments \| derivative_instrument	1	1
At inception notional	$ 45,000,000
Notional	$ 37,500,000
Interest rate caps
Derivative [Line Items]
Number of instruments \| derivative_instrument	1	1
At inception notional	$ 15,000,000
Notional	15,000,000
Remaining notional amount	$ 37,500,000
Cross-currency interest rate swap
Derivative [Line Items]
Number of instruments \| derivative_instrument	1	1
Cross-currency interest rate swap \| Pay
Derivative [Line Items]
Notional \| €		€ 42,000,517
Remaining notional amount \| €		€ 40,277,419
Cross-currency interest rate swap \| Receive
Derivative [Line Items]
Notional	$ 48,750,000
Remaining notional amount	$ 46,750,000

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

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

Derivative, Notional Amount At Inception. Expressed as an absolute value.

+ References

No definition available.

+ Details

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- Definition

Derivative, Remaining Notional Amount

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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