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Earnings per Common Share (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings per Common Share      
Weighted-average shares-basic 209,538 208,498 207,823
Dilution effect of stock options, stock appreciation rights and stock awards at end of period (in shares) 1,455 2,263 2,567
Weighted-average shares-diluted 210,993 210,761 210,390
Weighted-average stock awards and shares excluded from diluted earnings per share due to the anti-dilutive effect 43 2 567