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Consolidated Statements of Shareholders' Equity (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Beginning balance     $ 714,814 $ 643,855
Exercise of stock options     2,240 57
Tax benefit from exercise of stock options     176 2
Stock-based Compensation Expense     837 1,187
Cash dividends declared        
Common ($0.17 per share)     (17,816) (18,035)
Net earnings 23,619 21,038 45,887 37,638
Other comprehensive income 2,157 16,426 2,115 18,981
Ending balance 748,253 683,685 748,253 683,685
Common Stock
        
Beginning balance     479,973 490,226
Beginning balance, shares     104,482 106,076
Exercise of stock options     2,240 57
Exercise of stock options, Shares     326 8
Tax benefit from exercise of stock options     176 2
Stock-based Compensation Expense     837 1,187
Cash dividends declared        
Ending balance 483,226 491,472 483,226 491,472
Ending balance, shares 104,808 106,084 104,808 106,084
Retained Earnings
        
Beginning balance     193,372 147,444
Cash dividends declared        
Common ($0.17 per share)     (17,816) (18,035)
Net earnings     45,887 37,638
Ending balance 221,443 167,047 221,443 167,047
Accumulated Other Comprehensive Income/(Loss)
        
Beginning balance     41,469 6,185
Cash dividends declared        
Other comprehensive income     2,115 18,981
Ending balance $ 43,584 $ 25,166 $ 43,584 $ 25,166