Share Based Award Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding, Number	2,018,290	2,379,407
Options, Outstanding, Weighted Average Exercise Price	$ 58.90	$ 56.90
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years 5 months
Options, Outstanding, Intrinsic Value	$ 178,521
Options, Grants in Period, Gross	13,405
Options, Grants in Period, Weighted Average Exercise Price	$ 101.32
Options, Exercises in Period	(366,065)
Options, Exercises in Period, Weighted Average Exercise Price	$ 47.38
Options, Nonvested Options Forfeited, Number of Shares	(8,457)
Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value	$ 62.57
Options, Vested, Number of Shares	1,354,853
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 54.44
Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 9 months
Options, Exercisable, Intrinsic Value	$ 125,878
Options, Vested and Expected to Vest, Exercisable, Number	2,018,290
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 58.90
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	6 years 5 months
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 178,521