Stock Options (Aggregate Activity Under Stock Option Plans) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Stock Options Aggregate Activity Under Stock Option Plans Details
Options outstanding at beginning of year	6,656,000
Options granted	1,163,000
Options exercised	971,000
Options forfeited/expired	508,000
Options outstanding at September 30, 2014	6,340,000
Weighted-average exercise price of options outstanding, beginning of year	$ 8.03
Weighted-average exercise price of options granted during period	$ 33.20
Weighted-average exercise price of options exercised during the period	$ 7.85
Weighted-average exercise price of options forfeited/expired during the period	$ 10.26
Weighted-average exercise price of options outstanding, at September 30, 2014	$ 12.50
Weighted-average remaining contractual term of options outstanding, at September 30, 2014	7 years 135 days
Aggregate intrinsic value of options outstanding, at September 30, 2014	$ 94,207
Options Vested and Expected to Vest, Number of Shares	6,012,000
Options Vested and Expected to Vest, Weighted-Average Exercise Price Per Share	$ 12.05
Options Vested and Expected to Vest, Weighted-Average Remaining Contractual Term	7 years 106 days
Options Vested and Expected to Vest, Aggregate Intrinsic Value	91,391
Options Exercisable, Number of Shares	3,240,000
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 6.84
Options Exercisable, Weighted-Average Remaining Contractual Term	6 years 73 days
Options Exercisable, Aggregate Intrinsic Value	$ 62,086