Employee Benefit Plans (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	$ 138,196
Defined Benefit Plan, Benefit Obligation, Ending Balance	142,239	$ 138,196
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	138,196	111,195
Defined Benefit Plan, Service Cost	9,222	8,121	$ 8,023
Defined Benefit Plan, Interest Cost	5,035	4,972	4,072
Defined Benefit Plan, Contributions by Plan Participants	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	(1,919)	18,930
Defined Benefit Plan, Benefits Paid	(4,480)	(3,044)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	(3,815)	(1,978)
Defined Benefit Plan, Benefit Obligation, Ending Balance	142,239	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	59,782	30,759
Defined Benefit Plan, Service Cost	4,062	2,354	1,881
Defined Benefit Plan, Interest Cost	2,572	1,962	1,353
Defined Benefit Plan, Contributions by Plan Participants	229	174
Defined Benefit Plan, Actuarial Net (Gains) Losses	(2,729)	25,354
Defined Benefit Plan, Benefits Paid	(609)	(821)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 63,307	$ 59,782	$ 30,759