Share-Based Compensation and Capital Stock Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Proceeds from exercise of stock options			$ 6,677,000		$ 4,695,000
Frequency of Dividend Payments			quarterly
Dividends declared, per share	$ 0.185	$ 0.185	$ 0.56		$ 0.56
Dividends declared	10,800,000	10,700,000	32,300,000		32,100,000
Dividends paid			22,026,000		632,751,000
Common stock purchased under stock repurchase program, share	0	0	0		500,000
Stock Repurchased During Period, Value					19,900,000
Shares Paid for Tax Withholding for Share Based Compensation	795	1,525	98,182		64,037
Payments Related to Tax Withholding for Share-based Compensation	32,000	100,000	3,700,000		2,300,000
2012 Special Cash Dividend [Member]
Common Stock, Special Dividends, Per Share, Paid		$ 10.41			$ 10.41
Payments of Special Dividends		600,700,000			600,700,000
Quarterly [Member]
Common Stock Dividends, periodic payment, Per Share			$ 0.185
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	200,000		200,000
Stock options granted, fair value			1,700,000		1,600,000
Aggregate intrinsic value of stock options, outstanding	29,600,000		29,600,000
Aggregate intrinsic value of stock options, exercisable	23,400,000		23,400,000
Total intrinsic value of options exercised	500,000	500,000	3,400,000		1,000,000
Proceeds from exercise of stock options	700,000	4,300,000	6,700,000		4,700,000
Stock options exercised	29,008	109,996	263,073		135,200
Performance Vested Restricted Stock Units [Member]
Grants vested	0	0	39,816
Grants vested, total fair value			1,300,000
PVRSUs vested, initial grant target			30,624
PVRSU performance percentage target achieved			130.00%
PVRSU increase in shares due to performance percentage target achieved			9,192	[1]
Stock units forfeited	0	0	0		57,176
Dividends paid	$ 0	$ 0	$ 500,000		$ 0
Performance Vested Restricted Stock Units [Member] | Minimum [Member]
Vesting Range			0.00%
Award targets currently estimated to be achieved			81.00%
Performance Vested Restricted Stock Units [Member] | Maximum [Member]
Vesting Range			200.00%
Award targets currently estimated to be achieved			165.00%

[1] PVRSU shares have been increased by 9,192 units due to the Company exceeding the targeted performance conditions contained in PVRSUs granted in prior periods during the nine months ended September 30, 2013.