Employee Benefit Plans (Schedule of Changes in Projected Benefit Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 138,196	$ 111,195	$ 112,759
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	111,195
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, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	18,930	(8,957)
Defined Benefit Plan, Benefits Paid	(3,044)	(3,347)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(1,978)	(1,355)
Defined Benefit Plan, Benefit Obligation, Ending Balance	138,196	111,195
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	30,759	33,953
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, Contributions by Plan Participants	174	128
Defined Benefit Plan, Actuarial Net (Gains) Losses	25,354	(5,949)
Defined Benefit Plan, Benefits Paid	(821)	(607)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 59,782	$ 30,759	$ 33,953