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Derivatives and Risk Management (Derivative Notional Amounts) (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedging - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amount	$ 137,804	$ 127,749
After-tax, net unrealized losses on derivatives arising during period	(548)
Net amount expected to be reclassified to earnings in the next 12 months	(356)
Foreign Exchange Contract
Derivative [Line Items]
After-tax, net unrealized losses on derivatives arising during period	(287)
Net amount expected to be reclassified to earnings in the next 12 months	(287)
Foreign Exchange Contract | United Kingdom, Pounds
Derivative [Line Items]
Notional amount	16,928	6,663
Foreign Exchange Contract | Japan, Yen
Derivative [Line Items]
Notional amount	44,618	57,840
Foreign Exchange Contract | Canada, Dollars
Derivative [Line Items]
Notional amount	13,341	0
Interest Rate Swap Contracts
Derivative [Line Items]
Notional amount	62,917	$ 63,246
After-tax, net unrealized losses on derivatives arising during period	(261)
Net amount expected to be reclassified to earnings in the next 12 months	$ (69)

X

- 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

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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

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+ References

No definition available.

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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