Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Expiration period from date of grant	10 years
Period of service for immediate vesting upon death, disability or retirement	3 years
Unrecognized compensation cost related to unvested stock option and restricted stock grants	$ 16,200,000
Weighted average period over which cost is recognized, years	2 years 1 month 6 days
2004 Plan [Member]
Maximum shares	16,800,000
Expiration period from date of grant	7 years
2002 Plan [Member]
Maximum shares	300,000
2000 Plan [Member]
Maximum shares	1,125,000
Stock Options [Member]
Vesting period for stock awards from grant date	3 years
Stock-based compensation costs - expensed	5,494,000	5,427,000	4,959,000
Stock-based compensation costs - capitalized	4,812,000	4,468,000	3,365,000
Deferred tax benefit (liability) recorded	4,000,000	2,200,000	1,700,000
Weighted-average grant-date fair value of options granted	$ 13.39	$ 16.91	$ 18.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	21,700,000	44,100,000	27,000,000
Restricted Stock [Member]
Vesting period for stock awards from grant date	4 years
Stock-based compensation costs - expensed	7,432,000	6,368,000	5,591,000
Stock-based compensation costs - capitalized	7,469,000	5,994,000	5,162,000
Deferred tax benefit (liability) recorded	(14,800,000)	(1,400,000)	(2,100,000)
Weighted-average grant-date fair value of options granted	$ 38.92	$ 34.39	$ 36.41
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	62,500,000
Weighted average period over which cost is recognized, restricted stock (years)	3 years 4 months 24 days
Total fair value of restricted stock grants	43,200,000	18,500,000	19,400,000
Total fair value of shares vested	13,900,000	12,600,000	10,900,000
Performance Shares [Member]
Vesting period for stock awards from grant date	3 years
Stock-based compensation costs - expensed	3,300,000	19,100,000	15,800,000
Deferred tax benefit (liability) recorded	$ 45,300,000	$ 41,300,000
Maximum [Member] | 2004 Plan [Member]
Maximum shares	20,500,000