Capital Stock, Stock Awards, and Stock Options (Options Outstanding and Exercisable) (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares Outstanding	183,189	184,932
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	3 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 569.31	$ 566.55
Options Exercisable, Shares Exercisable	160,728
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	3 years 2 months 12 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 539.76
Exercise Price $244 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 244
Options Outstanding, Shares Outstanding	1,931
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 243.85
Options Exercisable, Shares Exercisable	1,931
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 243.85
Exercise Price $325 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 325
Options Outstanding, Shares Outstanding	77,258
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	1 year 1 month 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 325.26
Options Exercisable, Shares Exercisable	77,258
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	1 year 1 month 6 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 325.26
Exercise Price $719 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	$ 719
Options Outstanding, Shares Outstanding	77,258
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	4 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 719.15
Options Exercisable, Shares Exercisable	64,381
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	4 years 9 months 18 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 719.15
Exercise Price Range of $805-$872 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Low Exercise Price Range	805
High Exercise Price Range	$ 872
Options Outstanding, Shares Outstanding	26,742
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	6 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 865.02
Options Exercisable, Shares Exercisable	17,158
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	5 years 10 months 24 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 865.77