Share-Based Compensation (Details 1) (USD $)	6 Months Ended
	Jun. 30, 2013
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
Options granted, weighted average price	$ 0.00
Options granted, shares	0
Options canceled, weighted average price	$ 44.90
Options canceled, shares	(23,026)
Options exercised, weighted average price	$ 0.00
Options exercised, shares	0
Options oustanding, end of period, weighted average price	$ 32.96
Options outstanding, end of period, shares	1,562,568
Options exercisable, end of period, weighted average price	$ 32.44
Options exercisable, end of period, shares	1,276,225