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Shareholders' Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Period Start |  |  |  |  |  | $ 1,251,582,000 |  |  |  |  | $ 1,146,206,000 |  | $ 1,251,582,000 | $ 1,146,206,000 | $ 938,937,000
Net income | 56,230,000 | [1] | 104,909,000 | [2] | 56,454,000 | 58,412,000 | 59,171,000 | [3] | 62,904,000 | 38,558,000 | 56,953,000 | [4] | 276,005,000 | 217,586,000 | 312,541,000
Dividends |  |  |  |  |  |  |  |  |  |  |  |  | (186,828,000) | (164,514,000) | (158,486,000)
Issuance of shares under incentive stock plans |  |  |  |  |  |  |  |  |  |  |  |  | 13,451,000 | 26,314,000 | 11,115,000
Equity portion of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,850,000
Exchangeable Notes Hedge Purchased and Warrants Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,391,000)
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 16,181,000 | 15,223,000 | 15,754,000
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 5,681,000 | 5,411,000 | 2,720,000
Repurchase of common shares |  |  |  |  |  |  |  |  |  |  |  |  | (7,909,000) | (6,028,000) | (1,388,000)
Net gain (loss) from pension and postretirement plans |  |  |  |  |  |  |  |  |  |  |  |  | (46,263,000) | 6,385,000 | 4,879,000
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 3,546,000 | 4,162,000 | 15,980,000
New Zealand joint venture cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  | (2,373,000) | 837,000 | (2,305,000)
Stockholders' Equity Attributable to Parent, Period End | 1,323,073,000 |  |  |  |  |  | 1,251,582,000 |  |  |  |  |  | 1,323,073,000 | 1,251,582,000 | 1,146,206,000
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Taxable as Capital Gains |  |  |  |  |  |  |  |  |  |  |  |  | 1.52 | 1.36 | 1.03
Common Stock, Dividends, Per Share, Non-taxable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 | $ 1.36 | $ 1.33
Common Stock Including Additional Paid in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Period Start |  |  |  |  |  | 602,882,000 |  |  |  |  | 561,962,000 |  | 602,882,000 | 561,962,000 | 527,302,000
Shares, Issued |  |  |  |  |  | 121,023,140 |  |  |  |  | 119,312,961 |  | 121,023,140 | 119,312,961 | 118,221,646
Issuance of shares under incentive stock plans |  |  |  |  |  |  |  |  |  |  |  |  | 13,451,000 | 26,314,000 | 11,115,000
Issuance of shares under incentive stock plans, Shares |  |  |  |  |  |  |  |  |  |  |  |  | 1,220,731 | 1,914,341 | 1,165,358
Equity portion of convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,850,000
Exchangeable Notes Hedge Purchased and Warrants Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,391,000)
Share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 16,181,000 | 15,223,000 | 15,754,000
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 5,681,000 | 5,411,000 | 2,720,000
Repurchase of common shares |  |  |  |  |  |  |  |  |  |  |  |  | (7,909,000) | (6,028,000) | (1,388,000)
Stock repurchased during period, Shares |  |  |  |  |  |  |  |  |  |  |  |  | (208,694) | (204,162) | (74,043)
Stockholders' Equity Attributable to Parent, Period End | 630,286,000 |  |  |  |  |  | 602,882,000 |  |  |  |  |  | 630,286,000 | 602,882,000 | 561,962,000
Shares, Issued | 122,035,177 |  |  |  |  |  | 121,023,140 |  |  |  |  |  | 122,035,177 | 121,023,140 | 119,312,961
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Period Start |  |  |  |  |  | 717,058,000 |  |  |  |  | 663,986,000 |  | 717,058,000 | 663,986,000 | 509,931,000
Net income |  |  |  |  |  |  |  |  |  |  |  |  | 276,005,000 | 217,586,000 | 312,541,000
Dividends |  |  |  |  |  |  |  |  |  |  |  |  | (186,828,000) | (164,514,000) | (158,486,000)
Stockholders' Equity Attributable to Parent, Period End | 806,235,000 |  |  |  |  |  | 717,058,000 |  |  |  |  |  | 806,235,000 | 717,058,000 | 663,986,000
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Period Start |  |  |  |  |  | (68,358,000) |  |  |  |  | (79,742,000) |  | (68,358,000) | (79,742,000) | (98,296,000)
Net gain (loss) from pension and postretirement plans |  |  |  |  |  |  |  |  |  |  |  |  | (46,263,000) | 6,385,000 | 4,879,000
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | 3,546,000 | 4,162,000 | 15,980,000
New Zealand joint venture cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  | (2,373,000) | 837,000 | (2,305,000)
Stockholders' Equity Attributable to Parent, Period End | $ (113,448,000) |  |  |  |  |  | $ (68,358,000) |  |  |  |  |  | $ (113,448,000) | $ (68,358,000) | $ (79,742,000)
[1] | Fourth quarter 2011 included a pre-tax $6.5 million ($4.1 million after tax) increase in a disposition reserve.
[2] | Third quarter 2011 included a benefit of $16.0 million from the reversal of a reserve related to the taxability of the AFMC.
[3] | Fourth quarter 2010 included a tax benefit of $24.3 million related to the CBPC. See Note 8 — Income Taxes.
[4] | First quarter 2010 included a pre-tax $12.4 million ($11.5 million after tax) gain from the sale of a portion of the Company's interest in its New Zealand JV. See Note 5 — Joint Venture Investment for further information.

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