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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Class A [Member] | Common Class B [Member] | Common Stock [Member] Common Class A [Member] | Common Stock [Member] Common Class B [Member] | Surplus [Member] | Retained Earnings [Member] | Retained Earnings [Member] Common Class A [Member] | Retained Earnings [Member] Common Class B [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 1,559,115 |  |  | $ 8,757 | $ 1,678 | $ 143,766 | $ 1,429,863 |  |  | $ (24,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Adjustment resulting from adoption of a change in accounting for QSPEs and controlling financial interests effective January 1, 2010 | 4,904 |  |  |  |  |  | 4,904 |  |  |
Net income | 193,044 |  |  |  |  |  | 193,044 |  |  |
Change in other comprehensive income, net of tax | (11,580) |  |  |  |  |  |  |  |  | (11,580)
Cash dividends | (12,521) |  |  |  |  |  | (12,521) |  |  |
Ending Balance at Dec. 31, 2010 | 1,732,962 |  |  | 8,757 | 1,678 | 143,766 | 1,615,290 |  |  | (36,529)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income | 195,028 |  |  |  |  |  | 195,028 |  |  |
Change in other comprehensive income, net of tax | (30,045) |  |  |  |  |  |  |  |  | (30,045)
Repurchase of shares (value) |  | (16,785) | (7,602) | (113) | (38) |  |  | (16,672) | (7,564) |
Cash dividends | (12,430) |  |  |  |  |  | (12,430) |  |  |
Ending Balance at Dec. 31, 2011 | 1,861,128 |  |  | 8,644 | 1,640 | 143,766 | 1,773,652 |  |  | (66,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Net income | 134,348 |  |  |  |  |  | 134,348 |  |  |
Change in other comprehensive income, net of tax | (15,532) |  |  |  |  |  |  |  |  | (15,532)
Repurchase of shares (value) |  | (9,131) | (94,493) | (56) | (607) |  |  | (9,075) | (93,886) |
Cash dividends | (12,313) |  |  |  |  |  | (12,313) |  |  |
Ending Balance at Dec. 31, 2012 | $ 1,864,007 |  |  | $ 8,588 | $ 1,033 | $ 143,766 | $ 1,792,726 |  |  | $ (82,106)

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