Business Segment Information (Sales and Long-lived Assets by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 1,034,100	$ 883,400	$ 877,100	$ 866,300	$ 1,071,000	$ 945,900	$ 1,027,400	$ 946,200	$ 3,660,831	$ 3,990,487	$ 4,557,791
Percentage									100.00%	100.00%	100.00%
Long-Lived Assets	$ 871,518				$ 907,931				$ 871,518	$ 907,931	$ 982,757
Percentage	100.00%				100.00%				100.00%	100.00%	100.00%
Sales Revenue, Goods, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales to international customers to total sales									64.00%	64.00%	66.00%
GERMANY | Sales Revenue, Goods, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales to international customers to total sales									10.00%	10.00%	11.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 1,460,899	$ 1,537,779	$ 1,679,075
Percentage									40.00%	38.50%	36.90%
Long-Lived Assets	$ 333,126				$ 338,038				$ 333,126	$ 338,038	$ 338,556
Percentage	38.20%				37.20%				38.20%	37.20%	34.40%
EMA
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 1,434,506	$ 1,541,984	$ 1,773,281
Percentage									39.20%	38.60%	38.90%
Long-Lived Assets	$ 321,256				$ 288,903				$ 321,256	$ 288,903	$ 326,728
Percentage	36.90%				31.80%				36.90%	31.80%	33.20%
EMA | Sales Revenue, Goods, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales to international customers to total sales									10.00%
Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 471,054	$ 500,424	$ 562,792
Percentage									12.90%	12.50%	12.30%
Long-Lived Assets	$ 148,757				$ 144,599				$ 148,757	$ 144,599	$ 143,767
Percentage	17.10%				15.90%				17.10%	15.90%	14.60%
Asia | Sales Revenue, Goods, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales to international customers to total sales									10.00%
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									$ 294,372	$ 410,300	$ 542,643
Percentage									7.90%	10.40%	11.90%
Long-Lived Assets	$ 68,379				$ 136,391				$ 68,379	$ 136,391	$ 173,706
Percentage	7.80%				15.10%				7.80%	15.10%	17.80%
Other | Sales Revenue, Goods, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of net sales to international customers to total sales									10.00%