Share-Based Compensation And Capital Stock Narrative (Details) (USD $)	1 Months Ended	12 Months Ended			186 Months Ended		12 Months Ended																					0 Months Ended
	Oct. 31, 2005	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013 Prior To Stock Split [Member]	Dec. 31, 2013 Performance Vested Restricted Stock Units [Member]		Dec. 31, 2012 Performance Vested Restricted Stock Units [Member]	Dec. 31, 2011 Performance Vested Restricted Stock Units [Member]	Dec. 31, 2011 Performance Vested Restricted Stock Units [Member] Target Performance Not Met [Member]	Dec. 31, 2011 Performance Vested Restricted Stock Units [Member] Employee Termination [Member]	Dec. 31, 2013 Performance Vested Restricted Stock Units [Member] Adjustment [Member]	Dec. 31, 2012 Performance Vested Restricted Stock Units [Member] Adjustment [Member]	Dec. 31, 2011 Performance Vested Restricted Stock Units [Member] Adjustment [Member]	Dec. 31, 2013 Performance Vested Restricted Stock Units [Member] Minimum [Member]	Dec. 31, 2013 Performance Vested Restricted Stock Units [Member] Maximum [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member] Acceleration Of Award Vesting Conditions [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member] Acceleration Of Award Vesting Conditions [Member]	Dec. 31, 2013 Quarterly Dividends [Member]	Dec. 31, 2012 Quarterly Dividends [Member]	Aug. 23, 2012 2012 Special Cash Dividend [Member]	Jul. 27, 2012 2012 Special Cash Dividend [Member]
Frequency of Dividend Payments		quarterly
Annual amount, per share, of dividends declared																										$ 0.74	$ 0.74		$ 10.41
Dividends declared		$ 43,212,000	$ 643,374,000	$ 43,506,000																						$ 43,200,000	$ 42,700,000		$ 600,700,000
Payments of Dividends		32,799,000	654,092,000	43,747,000			500,000		0																			600,700,000
Dividends payable, date to be paid																												Aug. 23, 2012
Special dividend, per share, paid																												$ 10.41
Number of Shares Authorized		7,600,000			7,600,000
Number of Shares Available for Grant		3,500,000			3,500,000
Options granted, shares		173,413	160,408	166,306
Options granted, fair value		1,700,000	1,600,000	2,100,000
Aggregate intrinsic value of stock, options, outstanding		37,700,000			37,700,000
Aggregate intrinsic value of the stock options, exercisable			28,900,000
Total intrinsic value of options exercised		5,200,000	2,800,000	2,800,000
Proceeds from exercise of stock options		8,864,000	7,090,000	3,845,000
Stock options exercised		347,180	266,754	175,386
Stock Option Adjustment due to Special Dividend			497,497
Percentage Adjustment to Stock Option Exercise Price due to Special Dividend			24.00%
Vesting Range																0.00%	200.00%
Vesting Percentage For Stock based Award Target Achievement																71.00%	150.00%
Grants vested							39,816		0	0								227,890	198,415	205,222
Grant date fair value of shares vested							1,500,000
Grants vested, initial target							30,624
Grants vested, percentage							130.00%
Performance-Based Leveraging - Shares							9,192	[1]
Stock units forfeited							3,334		57,176	43,179	39,070	4,109						40,552	26,824	68,580
Allocated Share-based Compensation Expense		11,500,000	11,300,000	11,200,000			2,200,000		1,700,000	700,000			(300,000)	500,000	100,000			7,500,000	7,500,000	7,700,000	500,000	1,800,000	2,100,000	2,800,000	200,000
Stock Repurchased During Period, Shares		0	500,000		45,300,000	33,000,000
Common stock split, conversion ratio	2
Common stock purchased under stock repurchase program, value			19,900,000		1,100,000,000
Shares Paid for Tax Withholding for Share Based Compensation		103,880	75,105
Payments Related to Tax Withholding for Share-based Compensation		$ 4,000,000	$ 2,700,000

[1] PVRSU units outstanding have been increased by 9,192 units due to the Company exceeding the targeted performance conditions contained in PVRSU's granted in prior periods during the year ended December 31, 2013.