Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Information on the Company's business segments
Sales to external customers	$ 747,577	$ 765,264
Intersegment sales
Segment profit (loss)	27,764	32,208
Restructuring cost included in segment profit (loss)	4,760	6,094
Segment assets	2,055,466		2,025,977
North America [Member]
Information on the Company's business segments
Sales to external customers	382,808	388,135
Intersegment sales	3,734	2,003
Segment profit (loss)	33,806	38,005
Restructuring cost included in segment profit (loss)	1,784	4,700
Segment assets	819,632		772,269
International [Member]
Information on the Company's business segments
Sales to external customers	364,749	377,129
Intersegment sales	3,397	3,069
Segment profit (loss)	(6,042)	(5,797)
Restructuring cost included in segment profit (loss)	2,976	1,394
Segment assets	964,137		962,398
Eliminations and other [Member]
Information on the Company's business segments
Intersegment sales	(7,131)	(5,072)
Segment assets	$ 271,697		$ 291,310