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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."

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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