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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Consolidated Statements of Changes in Shareholders' Equity (Unaudited) [Abstract] |  |
Balance, January 1, | $ 1,215,037 | $ 1,149,484
Net income per consolidated statements of income | 89,573 | 82,583
Other comprehensive income | 4,127 | 31,032
Common stock dividends paid | (44,941) | (44,614)
Common stock issued-net, long-term incentive plans: |  |
Stock options | 268 | 1,507
Restricted stock | (1,203) | (1,867)
Excess tax benefit from stock-based compensation arrangements | 35 | 553
Compensation expense, long-term incentive plans | 3,119 | 2,928
Common stock issued, business combinations | 12,000 | 0
Balance at end of period | $ 1,278,015 | $ 1,221,606

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