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Derivatives and Risk Management (Derivative Notional Amounts) (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedging - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Notional amount | $ 134,707 | $ 121,608
After-tax, net unrealized losses on derivatives arising during period | (1,264) |
Net amount expected to be reclassified to earnings in the next 12 months | (1,075) |
Foreign Exchange Contract |  |
Derivative [Line Items] |  |
After-tax, net unrealized losses on derivatives arising during period | (1,011) |
Net amount expected to be reclassified to earnings in the next 12 months | (1,011) |
Foreign Exchange Contract | United Kingdom, Pounds |  |
Derivative [Line Items] |  |
Notional amount | 11,655 | 16,847
Foreign Exchange Contract | Japan, Yen |  |
Derivative [Line Items] |  |
Notional amount | 22,122 | 32,302
Foreign Exchange Contract | Canada, Dollars |  |
Derivative [Line Items] |  |
Notional amount | 15,779 | 16,494
Foreign Exchange Contract | Euro Member Countries, Euro |  |
Derivative [Line Items] |  |
Notional amount | 38,581 | 0
Interest Rate Swap Contracts |  |
Derivative [Line Items] |  |
Notional amount | 46,570 | $ 55,965
After-tax, net unrealized losses on derivatives arising during period | (253) |
Net amount expected to be reclassified to earnings in the next 12 months | $ (64) |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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