Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - Mar. 31, 2018	USD ($) derivative $ / £	GBP (£) derivative $ / £
Cash Flow \| Interest-rate swap contracts
Derivative [Line Items]
Notional	$ 43,000,000
Fixed Rate/Buy Amount (as a percent)	3.82%	3.82%
Fair value of interest rate hedge, liabilities	$ (1,931,000)
Number of interest-rate contracts held \| derivative	3	3
Net Investment \| Cross currency swap
Derivative [Line Items]
Notional \| £		£ 105,000,000
Fair value of interest rate hedge, liabilities	$ (16,684,000)
Foreign currency exchange rate \| $ / £	1.251	1.251
Long \| Net Investment \| Cross currency swap
Derivative [Line Items]
Notional \| £		£ 105,000,000
Fixed Rate/Buy Amount (as a percent)	2.58%	2.58%
Short \| Net Investment \| Cross currency swap
Derivative [Line Items]
Notional	$ 131,000,000
Fixed Rate/Buy Amount (as a percent)	3.75%	3.75%

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: 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

Reference 2: 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

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Fixed interest rate related to the interest rate derivative.

+ References

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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Number of interest rate derivative instruments held by the entity at the reporting date.

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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
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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