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Consolidated Statements of Changes in Equity (USD $)
In Thousands
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Non-Controlling Interest [Member]
Total
Balance at Dec. 31, 2009$ 415,637$ 854,490$ 568,532$ (838)$ 46,407$ 1,677$ 1,885,905
Net income  159,789  (139)159,650
Change in unrealized gain (loss) related to available for sale securities for which a portion of an other-than-temporary impairment has been recorded in earnings, net of tax    12,469 12,469
Change in unrealized gain (loss) on all other available for sale securities, net of tax    35,274 35,274
Amortization of pension loss, net of tax    1,054 1,054
Total comprehensive income      208,447
Distributions to non-controlling interest     (372)(372)
Purchase of treasury stock   (1,047)  (1,047)
Issuance of stock under purchase and equity compensation plans1,4255,439 (199)  6,665
Net tax benefit related to equity compensation plans 1,174    1,174
Stock-based compensation 4,669    4,669
Issuance of nonvested stock awards765(526) (239)   
Cash dividends paid  (58,836)   (58,836)
Balance at Sep. 30, 2010417,827865,246669,485(2,323)95,2041,1662,046,605
Balance at Dec. 31, 2010433,942971,293555,778(2,371)63,3451,4772,023,464
Net income  194,839  1,737196,576
Change in unrealized gain (loss) related to available for sale securities for which a portion of an other-than-temporary impairment has been recorded in earnings, net of tax    2,835 2,835
Change in unrealized gain (loss) on all other available for sale securities, net of tax    48,422 48,422
Amortization of pension loss, net of tax    1,179 1,179
Total comprehensive income      249,012
Distributions to non-controlling interest     (463)(463)
Purchase of treasury stock   (101,111)  (101,111)
Issuance of stock under purchase and equity compensation plans1,5635,261 7,236  14,060
Net tax benefit related to equity compensation plans 1,025    1,025
Stock-based compensation 3,614    3,614
Issuance of nonvested stock awards976(1,017) 41   
Cash dividends paid  (59,636)   (59,636)
Balance at Sep. 30, 2011$ 436,481$ 980,176$ 690,981$ (96,205)$ 115,781$ 2,751$ 2,129,965