Equity Incentive Plan Details 1 (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	1,871,694	2,104,775
Options, Outstanding, Weighted Average Exercise Price	$ 112.57	$ 94.45
Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 6 months 18 days
Options, Exercisable, Number	1,377,919
$0.0-$50.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	84,157
Options, Outstanding, Weighted Average Exercise Price	$ 46.32
Options, Outstanding, Weighted Average Remaining Contractual Term	1 year
Options, Exercisable, Number	84,157
$50.0-$70.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	339,250
Options, Outstanding, Weighted Average Exercise Price	$ 61.57
Options, Outstanding, Weighted Average Remaining Contractual Term	2 years 9 months 18 days
Options, Exercisable, Number	339,250
$70.0-$100.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	472,789
Options, Outstanding, Weighted Average Exercise Price	$ 81.31
Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 3 months 18 days
Options, Exercisable, Number	433,569
$100.0-$125.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	298,050
Options, Outstanding, Weighted Average Exercise Price	$ 108.90
Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Options, Exercisable, Number	298,050
$125.0-$150.0 Range of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	359,084
Options, Outstanding, Weighted Average Exercise Price	$ 141.51
Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 3 months 18 days
Options, Exercisable, Number	181,965
Greater than $150.0 Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award
Options, Outstanding, Number	318,364
Options, Outstanding, Weighted Average Exercise Price	$ 201.64
Options, Outstanding, Weighted Average Remaining Contractual Term	9 years 3 months 18 days
Options, Exercisable, Number	40,928