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Derivative Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net assets associated with foreign currency derivatives | $ 4,900,000 |  | $ 4,900,000 |  | $ (8,800,000)
Maturity period of derivatives (in months) |  |  | 18 months |  |
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months |  |  | $ 1,700,000 |  |
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 173,700,000 |  | 173,700,000 |  |
Designated as Hedging Instrument [Member] | United Kingdom, Pounds | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 81,700,000 |  | 81,700,000 |  |
Designated as Hedging Instrument [Member] | Australia, Dollars | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 33,700,000 |  | 33,700,000 |  |
Designated as Hedging Instrument [Member] | Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 22,800,000 |  | 22,800,000 |  |
Designated as Hedging Instrument [Member] | Brazil, Brazil Real | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 22,300,000 |  | 22,300,000 |  |
Designated as Hedging Instrument [Member] | No currency | Foreign Exchange Forward [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 13,200,000 |  | 13,200,000 |  |
Not Designated [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gains (losses) on derivatives not designated as hedging instruments | 5,700,000 | $ (3,500,000) | 6,200,000 | $ 900,000 |
Not Designated [Member] | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 131,300,000 |  | 131,300,000 |  |
Not Designated [Member] | United Kingdom, Pounds | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 6,900,000 |  | 6,900,000 |  |
Not Designated [Member] | Australia, Dollars | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 8,400,000 |  | 8,400,000 |  |
Not Designated [Member] | Euro Member Countries, Euro | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 86,500,000 |  | 86,500,000 |  |
Not Designated [Member] | Brazil, Brazil Real | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 6,600,000 |  | 6,600,000 |  |
Not Designated [Member] | Switzerland, Francs | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 6,500,000 |  | 6,500,000 |  |
Not Designated [Member] | Indonesia, Rupiahs | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | 9,600,000 |  | 9,600,000 |  |
Not Designated [Member] | No currency | Foreign Exchange Forward [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 6,800,000 |  | $ 6,800,000 |  |

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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 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: 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 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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