Share-Based Compensation (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock option activity in shares and weighted average price
Options outstanding, beginning of period, weighted average price	$ 33.13
Options outstanding, beginning of period, shares	1,585,594	1,700,000
Options granted, weighted average price	$ 0.00
Options granted, shares	0
Options canceled, weighted average price	$ 45.01
Options canceled, shares	(22,695)
Options exercised, weighted average price	$ 0.00
Options exercised, shares	0
Options oustanding, end of period, weighted average price	$ 32.96	$ 32.56
Options outstanding, end of period, shares	1,562,899	1,700,000
Options exercisable, end of period, weighted average price	$ 32.49
Options exercisable, end of period, shares	1,263,903