Share Based Compensation (Details Textuals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share Based Compensation Details [Abstract]
Companys Closing Stock Price Last Day Of Year	$ 18.13
Number Of In The Money Options Exercisable	40,000
Fair Value Of Options Vesting In The Period	0
Total intrinsic value of stock options excercised	300,000	21,500,000	50,700,000
Long Term Incentive Program Period	7,900,000	10,700,000	8,600,000
Long Term Incentive Program Total 2010 Program	11,700,000
Long Term Incentive Program Total 2011 Program	11,900,000
Long Term Incentive Program Total 2012 Program	12,100,000
Long Term Incentive Program Total 2009 Program	$ 24,100,000
Long Term Incentive Program Total 2009 Program Shares	409,160