Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Common stock - end of period $ 762,019
Dividends to shareholders (USD per share) $ 0.27
Treasury stock, shares acquired 9,924
Treasury stock, shares sold 183
Common Stock
 
Common stock - end of period $ 23,121