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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 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, 2009 | Sep. 30, 2009 | Jun. 30, 2009 | Mar. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Balance |  |  |  | $ 426,259 |  |  |  |  |  |  |  |  | $ 426,259 |  |
Balance, shares |  |  |  | 31,200,000 |  |  |  | 30,900,000 |  |  |  |  | 31,200,000 | 30,900,000 |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  | 41,450 | 7,230 | 1,520
Net income/(loss) | (7,200) | 16,700 | 8,800 | 16,700 | 20,500 | 3,600 | 7,900 | 5,600 | 3,700 | (5,100) | (12,700) | (19,400) | 34,938 | 37,636 | (33,458)
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (15,942) | (14,923) | (14,704)
Balance | 415,850 |  |  |  | 426,259 |  |  |  |  |  |  |  | 415,850 | 426,259 |
Balance, shares | 31,300,000 |  |  |  | 31,200,000 |  |  |  | 30,900,000 |  |  |  | 31,300,000 | 31,200,000 | 30,900,000
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 36 |  |  |  | 36 |  |  |  | 35 | 36 | 36 | 35
Balance, shares |  |  |  | 36,442,000 |  |  |  | 36,149,000 |  |  |  | 35,245,000 | 36,442,000 | 36,149,000 | 35,245,000
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1
Compensation and benefits paid or payable in shares, shares |  |  |  |  |  |  |  |  |  |  |  |  | 14,000 | 263,000 | 880,000
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  | 42,000 | 7,000 | 2,000
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan, shares |  |  |  |  |  |  |  |  |  |  |  |  | 43,000 | 23,000 | 22,000
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 37 |  |  |  | 36 |  |  |  | 36 |  |  |  | 37 | 36 | 36
Balance, shares | 36,541,000 |  |  |  | 36,442,000 |  |  |  | 36,149,000 |  |  |  | 36,541,000 | 36,442,000 | 36,149,000
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 3 |  |  |  | 3 |  |  |  | 3 | 3 | 3 | 3
Balance, shares |  |  |  | 3,236,000 |  |  |  | 3,236,000 |  |  |  | 3,236,000 | 3,236,000 | 3,236,000 | 3,236,000
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits paid or payable in shares, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 3 |  |  |  | 3 |  |  |  | 3 |  |  |  | 3 | 3 | 3
Balance, shares | 3,236,000 |  |  |  | 3,236,000 |  |  |  | 3,236,000 |  |  |  | 3,236,000 | 3,236,000 | 3,236,000
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 387,876 |  |  |  | 382,674 |  |  |  | 363,918 | 387,876 | 382,674 | 363,918
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  | 314 | 3,170 | 4,309
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  | 883 | 576 | 24
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  | 24 | (33) | (220)
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  | 2,398 | 1,489 | 571
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,202)
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,204
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 391,495 |  |  |  | 387,876 |  |  |  | 382,674 |  |  |  | 391,495 | 387,876 | 382,674
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 403,048 |  |  |  | 380,335 |  |  |  | 428,497 | 403,048 | 380,335 | 428,497
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  | 34,938 | 37,636 | (33,458)
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (15,942) | (14,923) | (14,704)
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 422,044 |  |  |  | 403,048 |  |  |  | 380,335 |  |  |  | 422,044 | 403,048 | 380,335
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (106,672) |  |  |  | (82,136) |  |  |  | (101,953) | (106,672) | (82,136) | (101,953)
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  | (13,070) | (10,208) | 38,363
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  | (17,749) | (14,052) | (18,546)
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (2,318) | (276) |
Balance | (139,809) |  |  |  | (106,672) |  |  |  | (82,136) |  |  |  | (139,809) | (106,672) | (82,136)
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (258,031) |  |  |  | (258,299) |  |  |  | (258,871) | (258,031) | (258,299) | (258,871)
Balance, shares |  |  |  | 8,485,000 |  |  |  | 8,497,000 |  |  |  | 8,523,000 | 8,485,000 | 8,497,000 | 8,523,000
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits paid or payable in shares, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  | 111 | 268 | 572
Shares issued to Directors, shares |  |  |  |  |  |  |  |  |  |  |  |  | (5,000) | (12,000) | (26,000)
Long-term incentive plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term incentive plan, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of equity-related tax issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | $ (257,920) |  |  |  | $ (258,031) |  |  |  | $ (258,299) |  |  |  | $ (257,920) | $ (258,031) | $ (258,299)
Balance, shares | 8,480,000 |  |  |  | 8,485,000 |  |  |  | 8,497,000 |  |  |  | 8,480,000 | 8,485,000 | 8,497,000

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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: 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 2: 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 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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