Employee Benefit Plans (Components of Net Periodic Benefit Cost Recognized in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	$ (43,025)	$ 21,624	$ (8,347)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	(485)	(525)	(298)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	8,121	8,023	7,531
Defined Benefit Plan, Interest Cost	4,972	4,072	4,072
Defined Benefit Plan, Expected Return on Plan Assets	(4,471)	(3,734)	(3,066)
Defined Benefit Plan, Amortization of Gains (Losses)	1,755	3,270	3,439
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	333	373	376
Defined Benefit Plan Recognized Net Gain Loss Due To Settlements	0	0	841
Defined Benefit Plan, Net Periodic Benefit Cost, Total	10,710	12,004	13,193
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	20,912	(11,250)	10,888
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(1,755)	(3,270)	(3,439)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	(333)	(373)	(376)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax	0	0	(841)
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments	(578)	(439)	219
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	18,246	(15,332)	6,451
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease	28,956	(3,328)	19,644
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Service Cost	2,354	1,881	1,641
Defined Benefit Plan, Interest Cost	1,962	1,353	1,246
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0
Defined Benefit Plan, Amortization of Gains (Losses)	1,060	868	743
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0
Defined Benefit Plan Recognized Net Gain Loss Due To Settlements	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost, Total	5,376	4,102	3,630
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	25,354	(5,949)	2,341
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, before Tax	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	(1,060)	(868)	(743)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	0	0	0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax	0	0	0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments	0	0	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	24,294	(6,817)	1,598
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease	$ 29,670	$ (2,715)	$ 5,228