Accumulated Other Comprehensive Loss (Reclassifications Out Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense									$ (9,504)	$ (10,409)	$ (10,361)
Other revenues									2,122	2,387	2,653
Total before tax									(7,855)	(22,020)	(32,639)
Tax (expense) or benefit									(11,963)	(157)	680
Net of tax	(16,868)	2,222	(1,859)	(1,653)	(11,540)	(1,782)	(704)	(7,936)	(18,157)	(21,962)	(31,549)
Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax									(877)	(2,807)
Gains And Losses On Derivatives Fair Value [Member] | Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									(2,227)	(3,771)
Tax (expense) or benefit
Net of tax									(2,227)	(3,771)
Gains And Losses On Derivatives Fair Value [Member] | Interest Rate Contract [Member] | Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense									(2,093)	(3,591)
Gains And Losses On Derivatives Fair Value [Member] | Foreign Exchange Contracts [Member] | Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other revenues									(134)	(180)
Defined Benefit Pension Items [Member] | Amount Reclassified From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs									97	(15)
Actuarial losses									1,253	979
Total before tax									1,350	964
Tax (expense) or benefit
Net of tax									$ 1,350	$ 964