Stock-Based Compensation Plans (Aggregate Activity Under Stock Option Plans) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Stock-based Compensation Plans Aggregate Activity Under Stock Option Plans Details
Options outstanding at beginning of year	6,656,000
Options granted	1,269,000
Options exercised	1,245,000
Options forfeited/expired	559,000
Options outstanding at end of year	6,121,000
Weighted-average exercise price of options outstanding, beginning of year	$ 8.03
Weighted-average exercise price of options granted during period	$ 32.80
Weighted-average exercise price of options exercised during the period	$ 7.48
Weighted-average exercise price of options forfeited/expired during the period	$ 11.56
Weighted-average exercise price of options outstanding at end of year	$ 12.96
Weighted-average remaining contractual term of options outstanding at end of year	7 years 77 days
Aggregate intrinsic value of options outstanding at end of year	$ 141,011
Options Vested and Expected to Vest, Number of Shares	5,838,000
Options Vested and Expected to Vest, Weighted-Average Exercise Price Per Share	$ 12.53
Options Vested and Expected to Vest, Weighted-Average Remaining Contractual Term	7 years 51 days
Options Vested and Expected to Vest, Aggregate Intrinsic Value	136,909
Options Exercisable, Number of Shares	3,246,000
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 7.16
Options Exercisable, Weighted-Average Remaining Contractual Term	6 years 40 days
Options Exercisable, Aggregate Intrinsic Value	$ 92,865