Stock Compensation Plans (Details) (USD $)	12 Months Ended										12 Months Ended									1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Stock Options [Member]		Dec. 31, 2012 Stock Options [Member]		Dec. 31, 2011 Stock Options [Member]		Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 55.94 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 37.74 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 45.15 - 47.34 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 54.33 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 48.46 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 36.65 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 48.30 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 55.74 [Member]	Dec. 31, 2013 Stock Options [Member] Exercise Price 58.76 [Member]	Jan. 31, 2014 Non-vested Common Stock [Member]	Dec. 31, 2013 Non-vested Common Stock [Member]	Dec. 31, 2012 Non-vested Common Stock [Member]	Dec. 31, 2011 Non-vested Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options awarded that vest annually				one-seventh
Expiration period (in years)				3 years
Stock options vesting period - tier two				2 years
Stock option expiration period - tier two (in days)				45 days
Share-based compensation arrangement by share-based payment award award vesting period (min)																					3 years
Share-based compensation arrangement by share-based payment award award vesting period (max)																					5 years
Required retention period after vesting (in years)																				2 years	2 years
Share-based Compensation Arragngement by Share-based Payment Award, Options, Outstanding, Number of Options [Abstract]
Number of options outstanding shares beginning balance (in shares)				1,890,786		2,621,347		3,135,334
Options awarded (in shares)				81,492		67,155		185,007
Options exercised (in shares)				(608,663)		(708,295)		(576,518)
Options forfeited (in shares)				(219,342)		(22,559)		(60,005)
Options expired (in shares)				(9,168)		(66,862)		(62,471)
Number of options outstanding shares ending balance (in shares)				1,135,105		1,890,786		2,621,347			214,483	1,267	84,725	134,485	233,739	253,607	47,581	81,492	83,726
Options shares vested (in shares)				424,459		601,367		825,682			102,311	1,267	84,725	74,447	80,747	61,449	11,007	0	8,506
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Abstract]
Options outstanding, weighted average exercise price, beginning balance (in dollars per share)				$ 48.29		$ 47.01		$ 45.62
Options awarded, weighted average exercise price (in dollars per share)				$ 55.74		$ 58.76		$ 55.94
Options exercised, weighted average exercise price (in dollars per share)				$ 48.00		$ 45.32		$ 44.35
Options forfeited, weighted average exercise price (in dollars per share)				$ 47.65		$ 50.36		$ 47.93
Options expired, weighted average exercise price (in dollars per share)				$ 50.61		$ 45.97		$ 54.13
Options outstanding, weighted average exercise price, ending balance (in dollars per share)				$ 49.09		$ 48.29		$ 47.01			$ 55.94	$ 37.74	$ 47.12	$ 54.33	$ 48.46	$ 36.65	$ 48.30	$ 55.74	$ 58.76
Options vested, weighted average exercise price (in dollars per share)				$ 49.49		$ 47.99		$ 46.72			$ 55.94	$ 37.74	$ 47.12	$ 54.33	$ 48.46	$ 36.65	$ 48.30	$ 0.00	$ 58.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Intrinsic Value [Abstract]
Options outstanding, aggregate intrinsic value				$ 19,564,000		$ 11,748,000		$ 20,769,000		$ 24,405,000
Options vested, aggregate intrinsic value				7,146,000		3,890,000		6,779,000
Options exercised, aggregate intrinsic value				8,500,000		8,300,000		5,500,000
Weighted average remaining contractual life (in years)											2 years 11 months 27 days	7 days	1 year 5 months 1 day	2 years 1 month 10 days	2 years 10 months 17 days	3 years 5 months 9 days	3 years 10 months 2 days	6 years 11 days	5 years 2 months 5 days
Weighted average remaining contractual life of options vested (in years)											8 months 27 days	7 days	1 year 5 months 1 day	1 year 4 months 13 days	1 year 7 months 28 days	1 year 7 months 21 days	1 year 6 months 4 days	0 years	2 years 11 days
Weighted average assumptions used to determine fair value of stock options awarded [Abstract]
Average risk-free interest rate (in hundredths)				0.89%	[1]	0.93%	[1]	1.87%	[1]
Dividend yield (in hundredths)				2.80%		2.20%		1.80%
Volatility factors				27.20%		28.00%		26.80%
Weighted average expected life				4 years 10 months 24 days		4 years 10 months 24 days		4 years 10 months 24 days
Weighted average fair value (in dollars per share)				$ 9.67		$ 11.48		$ 11.92
Share-based Compensation Expense Recognized				1,300,000		4,100,000		4,300,000													6,900,000	5,600,000	5,700,000
Share-based Compensation Costs, Including Costs That May Be Recognized As Future Expense [Abstract]
Unrecognized compensation cost of unvested awards, for future periods				1,900,000																13,300,000	15,300,000
Expected compensation expense, 2014				865,000																	7,000,000
Expected compensation expense, 2015				504,000																	6,300,000
Expected compensation expense, 2016				299,000																	1,800,000
Expected compensation expense, 2017				166,000																	175,000
Expected compensation expense, 2018				66,000
Expected compensation expense, thereafter				20,000																	0
Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock, Nonvested, Number of Shares [Roll Forward]
Non-vested common shares awarded, beginning of period (in shares)																				647,989	592,831
Non-vested common shares awarded during period (in shares)																					211,791
Non-vested shares that vested during period (in shares)																					(66,648)
Non-vested shares that forfeited during period (in shares)																					(89,985)
Non-vested common shares awarded, end of period (in shares)																					647,989	592,831
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant date fair value of non-vested shares awarded (in dollars per share)																				$ 64.37	$ 55.84
Weighted average grant date fair value non-vested stock awards vested (in dollars per share)																					$ 35.93
Weighted average grant date fair value non-vested stock awards forfeited (in dollars per share)																					$ 49.95
Deferred Compensation Plan [Abstract]
Recorded obligation for liability awards under deferred compensation plan	120,000	87,000
Compensation cost of liability awards recorded as an expense (benefit)	343,000	530,000	760,000
Additional Compensation Accrued for Certain Senior Executive Related to 2011 True-Up Plan	$ 69,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																				206,546
Vesting period (in years)				7 years																3 years

[1] Average risk-free interest rate represents U.S. Treasury rates matched to the expected life of the options.