Derivative Financial Instruments Derivative Financial Instruments (Schedule of Notional Amount and Fair Value of Open Foreign Currency Forward Contract) (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)	Dec. 31, 2018 MXN ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 GBP (£)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2017 MXN ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 GBP (£)
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				€ 4,014	£ 127
Financial Institution Counterparties [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative Counter Party [Line Items]
Forward Contracts Liability, Notional Amount		$ 11,003	$ 3,015	0	142		$ 25,413	$ 0	4,846	1,178
Customer Counterparties [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets, Notional Amount		$ 10,979	$ 3,000	0	145		$ 25,282	$ 0	3,867	0
Customer Counterparties [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative Counter Party [Line Items]
Forward Contracts Liability, Notional Amount				€ 0	£ 0				€ 4,041	£ 127
Eurodollar Future [Member] | Financial Institution Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	$ 0					$ 77
Forward Contracts, Liability Estimated Fair Value	0					(37)
Eurodollar Future [Member] | Customer Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	0					58
Forward Contracts, Liability Estimated Fair Value	0					(51)
Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts, Liability Estimated Fair Value	(13)					(142)
Foreign Exchange Forward [Member] | Customer Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	40					279
GBP Foreign Exchange Forward [Member] | Financial Institution Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	0					1
Forward Contracts, Liability Estimated Fair Value	(2)					(9)
GBP Foreign Exchange Forward [Member] | Customer Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	4					0
Forward Contracts, Liability Estimated Fair Value	0					0
MXN Foreign Exchange Forwards [Member] | Financial Institution Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts, Liability Estimated Fair Value	(132)					0
MXN Foreign Exchange Forwards [Member] | Customer Counterparties [Member]
Derivative Counter Party [Line Items]
Forward Contracts - Assets Estimated Fair Value	$ 149					$ 0