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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | 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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Balance |  |  |  | $ 415,850 |  |  |  |  |  |  |  |  | $ 415,850 |  |
Balance, shares |  |  |  | 31,300,000 |  |  |  | 31,200,000 |  |  |  |  | 31,300,000 | 31,200,000 |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  | 66,700 | 41,450 | 7,230
Net income/(loss) | 8,200 | 9,500 | (33,700) | 47,000 | (7,200) | 16,700 | 8,800 | 16,700 | 20,500 | 3,600 | 7,900 | 5,600 | 30,977 | 34,938 | 37,636
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (17,246) | (15,942) | (14,923)
Balance | 493,511 |  |  |  | 415,850 |  |  |  |  |  |  |  | 493,511 | 415,850 |
Balance, shares | 31,400,000 |  |  |  | 31,300,000 |  |  |  | 31,200,000 |  |  |  | 31,400,000 | 31,300,000 | 31,200,000
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Compensation and benefits paid or payable in shares, shares |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 | 57,000 | 296,000
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised, shares |  |  |  |  |  |  |  |  |  |  |  |  | 67,000 | 42,000 | 7,000
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 37 |  |  |  | 37 |  |  |  | 36 |  |  |  | 37 | 37 | 36
Balance, shares | 36,642,000 |  |  |  | 36,541,000 |  |  |  | 36,442,000 |  |  |  | 36,642,000 | 36,541,000 | 36,442,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 391,495 |  |  |  | 387,876 |  |  |  | 382,674 | 391,495 | 387,876 | 382,674
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,573 | 2,712 | 4,659
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  | 1,352 | 883 | 576
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  | (39) | 24 | (33)
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 395,381 |  |  |  | 391,495 |  |  |  | 387,876 |  |  |  | 395,381 | 391,495 | 387,876
Retained Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 422,044 |  |  |  | 403,048 |  |  |  | 380,335 | 422,044 | 403,048 | 380,335
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  | 30,977 | 34,938 | 37,636
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  | (17,246) | (15,942) | (14,923)
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | 435,775 |  |  |  | 422,044 |  |  |  | 403,048 |  |  |  | 435,775 | 422,044 | 403,048
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | (139,809) |  |  |  | (106,672) |  |  |  | (82,136) | (139,809) | (106,672) | (82,136)
Compensation and benefits paid or payable in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued to Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  | 11,452 | (13,070) | (10,208)
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 79,204 |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  | (30,584) | (17,749) | (14,052)
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (284) | (2,318) | (276)
Balance | (80,021) |  |  |  | (139,809) |  |  |  | (106,672) |  |  |  | (80,021) | (139,809) | (106,672)
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
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 |  |  |  |  |  |  |  |  |  |  |  |  | 256 | 111 | 268
Shares issued to Directors, shares |  |  |  |  |  |  |  |  |  |  |  |  | (12,000) | (5,000) | (12,000)
Net income/(loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative translation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of certain pension plan liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement liability adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative valuation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance | $ (257,664) |  |  |  | $ (257,920) |  |  |  | $ (258,031) |  |  |  | $ (257,664) | $ (257,920) | $ (258,031)
Balance, shares | 8,468,000 |  |  |  | 8,480,000 |  |  |  | 8,485,000 |  |  |  | 8,468,000 | 8,480,000 | 8,485,000

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