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Derivative Financial Instruments - Schedule of Derivative Instruments (Details) - Sep. 30, 2017 | USD ($) derivative $ / £ | GBP (£) derivative $ / £
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Cash Flow | Interest-rate swap contracts |  |
Derivative [Line Items] |  |
Notional | $ 44,000,000 |
Fixed Rate/Buy Amount (as a percent) | 3.82% | 3.82%
Fair value of interest rate hedge, liabilities | $ (2,980,000) |
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 | $ (9,469,000) |
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) | 2.584% | 2.584%
Short | Net Investment | Cross currency swap |  |
Derivative [Line Items] |  |
Notional | $ 131,400,000 |
Fixed Rate/Buy Amount (as a percent) | 3.75% | 3.75%

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