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Derivative Financial Instruments Derivative Financial Instruments (Schedule of Notional Amount and Fair Value of Open Foreign Currency Forward Contract) (Details) € in Thousands, £ in Thousands, CAD in Thousands, $ in Thousands | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 GBP (£) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 GBP (£)
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Financial Institution Counterparties [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets, Notional Amount |  |  | € 0 | £ 0 |  |  | € 1,247 | £ 568
Financial Institution Counterparties [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts Liability, Notional Amount |  | CAD 2,214 | 870 | £ 419 |  | CAD 1,440 | 572 | £ 0
Customer Counterparties [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets, Notional Amount |  | CAD 2,205 | 0 |  |  | CAD 1,437 | 575 |
Customer Counterparties [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts Liability, Notional Amount | € |  |  | € 0 |  |  |  | € 343 |
Eurodollar Future [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets Estimated Fair Value | $ 0 |  |  |  | $ 13 |  |  |
Forward Contracts, Liability Estimated Fair Value | (9) |  |  |  | (18) |  |  |
Eurodollar Future [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets Estimated Fair Value | 0 |  |  |  | 22 |  |  |
Forward Contracts, Liability Estimated Fair Value | 0 |  |  |  | (5) |  |  |
Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts, Liability Estimated Fair Value | (21) |  |  |  | (5) |  |  |
Foreign Exchange Forward [Member] | Customer Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets Estimated Fair Value | 29 |  |  |  | 9 |  |  |
GBP Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member] |  |  |  |  |  |  |  |
Derivative Counter Party [Line Items] |  |  |  |  |  |  |  |
Forward Contracts - Assets Estimated Fair Value | 0 |  |  |  | 2 |  |  |
Forward Contracts, Liability Estimated Fair Value | $ (3) |  |  |  | $ 0 |  |  |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 + Details
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