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Changes in Stockholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Balance |  |  | $ 415,850 |
Net income | 9,463 | 16,674 | 22,759 | 42,169
Dividends declared |  |  | (12,849) |
Compensation and benefits paid or payable in Class A Common Stock |  |  | 1,446 |
Options exercised |  |  | 1,116 |
Currency translation adjustment |  |  | 3,899 |
Pension settlement |  |  | 79,204 |
Pension plan remeasurement |  |  | (17,347) |
Change in pension liability adjustment |  |  | 2,645 |
Change in derivative valuation adjustment |  |  | (548) |
Balance | 496,175 |  | 496,175 |
Class A Common Stock [Member] |  |  |  |
Balance |  |  | 37 |
Net income |  |  |  |
Dividends declared |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  |  |
Options exercised |  |  |  |
Currency translation adjustment |  |  |  |
Pension settlement |  |  |  |
Pension plan remeasurement |  |  |  |
Change in pension liability adjustment |  |  |  |
Change in derivative valuation adjustment |  |  |  |
Balance | 37 |  | 37 |
Class B Common Stock [Member] |  |  |  |
Balance |  |  | 3 |
Net income |  |  |  |
Dividends declared |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  |  |
Options exercised |  |  |  |
Currency translation adjustment |  |  |  |
Pension settlement |  |  |  |
Pension plan remeasurement |  |  |  |
Change in pension liability adjustment |  |  |  |
Change in derivative valuation adjustment |  |  |  |
Balance | 3 |  | 3 |
Additional Paid-in Capital [Member] |  |  |  |
Balance |  |  | 391,495 |
Net income |  |  |  |
Dividends declared |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  | 1,190 |
Options exercised |  |  | 1,116 |
Currency translation adjustment |  |  |  |
Pension settlement |  |  |  |
Pension plan remeasurement |  |  |  |
Change in pension liability adjustment |  |  |  |
Change in derivative valuation adjustment |  |  |  |
Balance | 393,801 |  | 393,801 |
Retained Earnings [Member] |  |  |  |
Balance |  |  | 422,044 |
Net income |  |  | 22,759 |
Dividends declared |  |  | (12,849) |
Compensation and benefits paid or payable in Class A Common Stock |  |  |  |
Options exercised |  |  |  |
Currency translation adjustment |  |  |  |
Pension settlement |  |  |  |
Pension plan remeasurement |  |  |  |
Change in pension liability adjustment |  |  |  |
Change in derivative valuation adjustment |  |  |  |
Balance | 431,954 |  | 431,954 |
Accumulated Items of Other Comprehensive Income [Member] |  |  |  |
Balance |  |  | (139,809) |
Net income |  |  |  |
Dividends declared |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  |  |
Options exercised |  |  |  |
Currency translation adjustment |  |  | 3,899 |
Pension settlement |  |  | 79,204 |
Pension plan remeasurement |  |  | (17,347) |
Change in pension liability adjustment |  |  | 2,645 |
Change in derivative valuation adjustment |  |  | (548) |
Balance | (71,956) |  | (71,956) |
Treasury Stock [Member] |  |  |  |
Balance |  |  | (257,920) |
Net income |  |  |  |
Dividends declared |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  | 256 |
Options exercised |  |  |  |
Currency translation adjustment |  |  |  |
Pension settlement |  |  |  |
Pension plan remeasurement |  |  |  |
Change in pension liability adjustment |  |  |  |
Change in derivative valuation adjustment |  |  |  |
Balance | $ (257,664) |  | $ (257,664) |

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- Definition Value stock issued during the period as a result of the exercise of stock options. + 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 210.5-02.29-31) -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 29, 30, 31 -Article 5 + Details
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