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Consolidated Statements of Shareholders' Equity (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Beginning balance $ 714,814 $ 643,855
Exercise of stock options 1,355 19
Tax benefit from exercise of stock options 110 2
Stock-based compensation expense 405 590
Cash dividends declared    
Common ($0.085 per share) (8,903) (9,017)
Net earnings 22,268 16,600
Other comprehensive income (42) 2,555
Ending balance 730,007 654,604
Common Stock
    
Beginning balance 479,973 490,226
Beginning balance, shares 104,482 106,076
Exercise of stock options 1,355 19
Exercise of stock options, Shares 225 2
Tax benefit from exercise of stock options 110 2
Stock-based compensation expense 405 590
Cash dividends declared    
Ending balance 481,843 490,837
Ending balance, shares 104,707 106,078
Retained Earnings
    
Beginning balance 193,372 147,444
Cash dividends declared    
Common ($0.085 per share) (8,903) (9,017)
Net earnings 22,268 16,600
Ending balance 206,737 155,027
Accumulated Other Comprehensive Income/(Loss)
    
Beginning balance 41,469 6,185
Cash dividends declared    
Other comprehensive income (42) 2,555
Ending balance $ 41,427 $ 8,740