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Derivative Instruments (Narrative) (Details) $ in Thousands, £ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 GBP (£) instrument | Jul. 01, 2016 instrument | Jun. 30, 2016 USD ($)
Derivative [Line Items] |  |  |  |  |
Gain (loss) to be reclassified within twelve months | $ 4,700 |  |  |  |
Proceeds from forward contracts | 0 | $ 51,308 |  |  |
Designated as Hedging Instrument | Currency forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Instruments | instrument |  |  | 4 | 4 |
Notional amount | £ |  |  | £ 357.3 |  |
Proceeds from forward contracts | 64,000 |  |  |  |
Amount of AOCI to remain in AOCI | $ 26,200 |  |  |  |
Not Designated as Hedging Instrument | Currency forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value of derivatives |  |  |  |  | $ 37,800

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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