Equity Incentive Plan Details 1 (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	2,104,775	2,394,938
Options, Outstanding, Weighted Average Exercise Price	$ 94.45	$ 82.16
Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 6 months 22 days
Options, Exercisable, Number	1,337,939
$0.0-$50.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	307,498
Options, Outstanding, Weighted Average Exercise Price	$ 43.26
Options, Outstanding, Weighted Average Remaining Contractual Term	1 year 7 months 6 days
Options, Exercisable, Number	307,498
$50.0-$70.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	398,000
Options, Outstanding, Weighted Average Exercise Price	$ 60.22
Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 8 months 11 days
Options, Exercisable, Number	398,000
$70.0-$100.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	500,732
Options, Outstanding, Weighted Average Exercise Price	$ 81.33
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 7 days
Options, Exercisable, Number	354,906
$100.0-$125.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	344,800
Options, Outstanding, Weighted Average Exercise Price	$ 109.09
Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 11 months 10 days
Options, Exercisable, Number	161,550
$125.0-$150.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	371,239
Options, Outstanding, Weighted Average Exercise Price	$ 141.47
Options, Outstanding, Weighted Average Remaining Contractual Term	8 years 3 months 30 days
Options, Exercisable, Number	115,985
Greater than $150.0 Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	182,506
Options, Outstanding, Weighted Average Exercise Price	$ 169.37
Options, Outstanding, Weighted Average Remaining Contractual Term	9 years 9 months 30 days
Options, Exercisable, Number	0