Segment Information Revenues and Operating Net Assets by Geographical Areas (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Operating Net Assets	$ 883,760	$ 765,560	$ 711,290
Continuing Operations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	1,272,910	1,083,960	902,460
Operating Net Assets	883,760	765,560	686,640	[1]
Continuing Operations [Member] | Total Non-U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	233,520	197,510	165,610
Operating Net Assets	244,530	217,100	151,860	[1]
Continuing Operations [Member] | Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	62,400	68,820	61,990
Operating Net Assets	102,250	113,950	68,470	[1]
Continuing Operations [Member] | Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	100,620	88,640	75,730
Operating Net Assets	32,400	30,870	27,320	[1]
Continuing Operations [Member] | Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	32,230	9,500	3,740
Operating Net Assets	38,130	30,630	26,450	[1]
Continuing Operations [Member] | Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	4,180	950	0
Operating Net Assets	3,090	2,990	0	[1]
Continuing Operations [Member] | Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	34,090	29,600	24,150
Operating Net Assets	68,660	38,660	29,620	[1]
Continuing Operations [Member] | Total U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	1,039,390	886,450	736,850
Operating Net Assets	$ 639,230	$ 548,460	$ 534,780	[1]

[1] Excludes discontinued operations. See Note 6, "Discontinued Operations."