Fair Value Measurements (Overview of the Valuation Techniques and Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		$ 4,598	$ 2,160
Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	18,129	22,227
Recurring [Member] | Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities	[1]	$ 6,953	7,304
Recurring [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		24 months
Recurring [Member] | Level 3 [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Time Until Resolution		48 months
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values, Liabilities		$ 6,953	$ 7,304
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.62%
Recurring [Member] | Level 3 [Member] | Measurement Input, Conversion Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		1.59%
Recurring [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		6.00%
Recurring [Member] | Level 3 [Member] | Measurement Input, VISA Class A Appreciation [Member] | Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Values Utilized		18.00%

[1] For further disaggregation of derivative assets and liabilities, see Note 7 - Derivatives.