Stock-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended						1 Months Ended		3 Months Ended								3 Months Ended
	Mar. 31, 2014 plan		Mar. 31, 2013		Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2014 Market and Service Condition Stock Units [Member]	Mar. 31, 2013 Market and Service Condition Stock Units [Member]	Mar. 31, 2014 Market and Service Condition Stock Units [Member]	Mar. 31, 2014 Non-vested Stock Units [Member]	Mar. 31, 2013 Non-vested Stock Units [Member] installment	Mar. 31, 2014 Vesting on first anniversary of date of grant [Member] Stock Options [Member]	Mar. 31, 2014 Vesting in equal monthly installments after first anniversary of date of grant [Member] Stock Options [Member]	Mar. 31, 2014 Annual vesting on each anniversary [Member] Non-vested Stock Units [Member]	Mar. 31, 2014 Vesting on third anniversary [Member] Non-vested Stock Units [Member]	Mar. 31, 2014 2005 Plan [Member]	Mar. 31, 2014 2005 Plan [Member] Minimum [Member]	Mar. 31, 2014 2005 Plan [Member] Maximum [Member]	Mar. 31, 2014 2005 ESPP Plan [Member]	Mar. 31, 2013 2005 ESPP Plan [Member]	Mar. 31, 2014 2005 ESPP Plan [Member] Minimum [Member]	Mar. 31, 2014 2005 ESPP Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered	2
Shares authorized for issuance under 2005 Equity Incentive Plan																48,600,000			10,000,000
Ownership percentage of company where incentive stock options must be granted with an exercise price greater than fair market value																		10.00%
Exercise price of incentive stock options granted to individuals owning 10% or more of the Company's common stock, as a percentage of fair market value of common stock on the date of grant																	110.00%
Shares reserved for issuance under the 2005 Equity Incentive Plan																25,544,821
Shares available for grant under the 2005 Equity Incentive Plan																14,890,200
Employee Stock Purchase Plan, payment period																			6 months
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay																					1.00%	10.00%
Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase																			12,000
Employee Stock Purchase Plan, purchase price as a percentage of fair market value																			85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock																			5.00%
Employee Stock Purchase Plan, total shares issued under plan																			3,305,371
stock-based compensation cost	$ 40,701,000	[1]	$ 43,556,000	[1]															$ 1,400,000	$ 1,300,000
Stock options vesting life assumed					5 years
Stock option vesting period					3 years
Award vesting percentage												33.30%	2.78%	33.33%	100.00%
Vesting period of options from acquisitions					3 years
The total intrinsic value of options exercised					12,800,000	30,500,000
Total unrecognized compensation cost					19,900,000
Total unrecognized compensation cost recognition period					1 year 1 month 20 days					2 years 2 months 4 days
Non-vested stock unit awards granted to senior level employees							378,022	399,029
Period to determine actual stock grant following end of performance period							60 days
Performance period for grants							3 years
Maximum percentage of market and service condition stock units that will ultimately vest									200.00%
Percentage that Company's return exceeds indexed return									40.00%
Percentage that Company's return underperforms index									20.00%
Percent of award issued if return is negative but index is met									75.00%
Number of shares represented by each non-vested stock unit upon vesting										1
The estimated fair value of each award (in dollars per share)										$ 56.94	$ 89.93
Stock-based compensation award vesting period, number of monthly installments											12
Share based awards granted and outstanding										5,423,734
Total unrecognized compensation cost related to stock-based compensation										$ 307,300,000

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.