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Shareholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stockholders' Equity Attributable to Parent, Period Start | $ 1,323,073 | $ 1,251,582 | $ 1,251,582
Net Income | 53,437 | 58,412 | 276,005
Dividends | (48,985) |  | (186,828)
Issuance of shares under incentive stock plans | 2,061 |  | 13,451
Stock-based compensation | 6,466 |  | 16,181
Excess tax benefit on stock-based compensation | 3,946 |  | 5,681
Repurchase of common shares | (7,783) |  | (7,909)
Net gain (loss) from pension and postretirement plans | 3,140 | 2,093 | (46,263)
Foreign currency translation adjustment | 5,825 | 288 | 3,546
Joint venture cash flow hedges | 1,205 | (567) | (2,373)
Stockholders' Equity Attributable to Parent, Period End | 1,342,385 |  | 1,323,073
Dividends [Abstract] |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.40 | $ 0.36 | $ 1.52
Common Stock Including Additional Paid in Capital [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stockholders' Equity Attributable to Parent, Period Start | 630,286 | 602,882 | 602,882
Shares Issued, Period Start | 122,035,177 | 121,023,140 | 121,023,140
Issuance of shares under incentive stock plans | 2,061 |  | 13,451
Issuance of shares under incentive stock plan, Shares | 585,351 |  | 1,220,731
Stock-based compensation | 6,466 |  | 16,181
Excess tax benefit on stock-based compensation | 3,946 |  | 5,681
Repurchase of common shares | (7,783) |  | (7,909)
Stock Repurchased During Period, Shares | (169,757) |  | (208,694)
Shares Issued, Period End | 122,450,771 |  | 122,035,177
Stockholders' Equity Attributable to Parent, Period End | 634,976 |  | 630,286
Retained Earnings [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stockholders' Equity Attributable to Parent, Period Start | 806,235 | 717,058 | 717,058
Net Income | 53,437 |  | 276,005
Dividends | (48,985) |  | (186,828)
Stockholders' Equity Attributable to Parent, Period End | 810,687 |  | 806,235
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Stockholders' Equity Attributable to Parent, Period Start | (113,448) | (68,358) | (68,358)
Net gain (loss) from pension and postretirement plans | 3,140 |  | (46,263)
Foreign currency translation adjustment | 5,825 |  | 3,546
Joint venture cash flow hedges | 1,205 |  | (2,373)
Stockholders' Equity Attributable to Parent, Period End | $ (103,278) |  | $ (113,448)

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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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