Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2015 $ / shares shares	Mar. 31, 2014 $ / shares shares	Jun. 30, 2015 USD ($) plan shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) installment plan shares	Jun. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered | plan			2		2
Stock-based compensation cost | $			$ 30,792	$ 45,290	$ 65,003	$ 85,991
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed					5 years
Stock option vesting period					3 years
Total unrecognized compensation cost recognition period					6 months 15 days
Vesting period of options from acquisitions					3 years
The total intrinsic value of options exercised | $			9,900	7,200	$ 13,800	20,100
Total unrecognized compensation cost | $			$ 1,000		$ 1,000
Market and Service Condition Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees	393,464	378,022
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%
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares represented by each non-vested stock unit upon vesting					1
The estimated fair value of each award (in dollars per share) | $ / shares	$ 61.01	$ 56.94
Number of shares per non-vested stock unit					1
Stock-based compensation award vesting period, number of monthly installments | installment					12
Share based awards granted and outstanding			5,142,825		5,142,825
Total unrecognized compensation cost related to stock-based compensation | $			$ 256,200		$ 256,200
Stock option vesting period					3 years
Total unrecognized compensation cost recognition period					2 years 2 months
Vesting on first anniversary of date of grant [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					33.30%
Vesting in equal monthly installments after first anniversary of date of grant [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					2.78%
Annual vesting on each anniversary [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					33.33%
Superseded and Expired Stock Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed					5 years
Superseded and Expired Stock Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed					10 years
2015 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under 2005 Equity Incentive Plan			16,000,000		16,000,000
Employee Stock Purchase Plan, payment period					6 months
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			0		0
2015 ESPP [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%
2015 ESPP [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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					10.00%
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $			$ 1,300	$ 1,300	$ 2,900	$ 2,700
2005 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, total shares issued under plan			3,872,661		3,872,661
Common Stock [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under 2005 Equity Incentive Plan			29,000,000		29,000,000
Shares reserved for issuance under the 2005 Equity Incentive Plan			30,981,477		30,981,477
Shares available for grant under the 2005 Equity Incentive Plan			23,036,372		23,036,372