Employee and Retiree Benefit Plans (Amount Related to Foreign Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at December 31	$ 487,094	$ 563,825
Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at December 31	170,551	212,533
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at December 31	777,645	881,932	$ 815,593
Fair value of plan assets at December 31	487,094	563,825	519,357
Net plan liabilities recognized	(290,551)	(318,107)
Net periodic benefit expense (benefit)	28,840	24,102	23,358
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at December 31	173,860	222,483
Fair value of plan assets at December 31	170,551	212,535
Net plan liabilities recognized	3,309	9,948
Net periodic benefit expense (benefit)	3,983	194
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at December 31	94,779	106,276	106,679
Fair value of plan assets at December 31
Net plan liabilities recognized	(94,779)	(106,276)
Net periodic benefit expense (benefit)	5,354	4,971	$ 5,575
Other Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at December 31	812	791
Net plan liabilities recognized	812	791
Net periodic benefit expense (benefit)	$ 146	$ 133