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Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Balance | $ 493,511 |
Net income | 11,511 | 47,041
Dividends declared | (4,421) |
Compensation and benefits paid or payable in shares | (698) |
Options exercised | 2,315 |
Cumulative translation adjustment | (11,288) |
Change in pension liability adjustment | 1,169 |
Change in derivative valuation adjustment | 279 |
Balance | 492,378 |
Common Class A [Member] |  |
Balance | 37 |
Net income |  |
Dividends declared |  |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Cumulative translation adjustment |  |
Change in pension liability adjustment |  |
Change in derivative valuation adjustment |  |
Balance | 37 |
Common Class B [Member] |  |
Balance | 3 |
Net income |  |
Dividends declared |  |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Cumulative translation adjustment |  |
Change in pension liability adjustment |  |
Change in derivative valuation adjustment |  |
Balance | 3 |
Additional Paid-in Capital [Member] |  |
Balance | 395,381 |
Net income |  |
Dividends declared |  |
Compensation and benefits paid or payable in shares | (698) |
Options exercised | 2,315 |
Cumulative translation adjustment |  |
Change in pension liability adjustment |  |
Change in derivative valuation adjustment |  |
Balance | 396,998 |
Retained Earnings [Member] |  |
Balance | 435,775 |
Net income | 11,511 |
Dividends declared | (4,421) |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Cumulative translation adjustment |  |
Change in pension liability adjustment |  |
Change in derivative valuation adjustment |  |
Balance | 442,865 |
Accumulated Other Comprehensive Income [Member] |  |
Balance | (80,021) |
Net income |  |
Dividends declared |  |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Cumulative translation adjustment | (11,288) |
Change in pension liability adjustment | 1,169 |
Change in derivative valuation adjustment | 279 |
Balance | (89,861) |
Treasury Stock [Member] |  |
Balance | (257,664) |
Net income |  |
Dividends declared |  |
Compensation and benefits paid or payable in shares |  |
Options exercised |  |
Cumulative translation adjustment |  |
Change in pension liability adjustment |  |
Change in derivative valuation adjustment |  |
Balance | $ (257,664) |

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