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Stockholders' Equity (Details)
 1 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Dec. 31, 2012
Treasury Stock [Member]
Dec. 31, 2011
Treasury Stock [Member]
Dec. 31, 2010
Treasury Stock [Member]
Stockholders' Equity                  
Common Stock, at January 1   29,554,500 29,554,500 29,555,000 29,555,000 29,555,000      
Treasury Stock, at January 1             6,507,000 5,851,000 5,890,000
Exercise of options       0 0 0      
Exercise of options, Treasury Stock             (333,000) (236,000) (186,000)
Stock purchases       0 0 0      
Stock purchases, Treasury Stock             48,000 1,087,000 147,000
Settlement of New Market 195,313     0 0 0      
Settlement of New Market, Treasury Stock             0 (195,000) 0
Common Stock, at December 31   29,554,500 29,554,500 29,555,000 29,555,000 29,555,000      
Treasury Stock, at December 31             6,222,000 6,507,000 5,851,000