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Number of stock-based compensation plans offered

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Employee Stock-Based Compensation and Benefit Plans (Narrative) (Details) $ in Thousands					1 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($) plan shares	Apr. 06, 2020 shares	Apr. 01, 2020 shares	Apr. 22, 2019 USD ($)	Apr. 30, 2019 shares	Feb. 28, 2019 shares	Mar. 31, 2018 shares	Dec. 31, 2020 USD ($) plan shares	Dec. 31, 2019 USD ($) installment	Dec. 31, 2018 USD ($)	Jun. 30, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered \| plan	1							1
Stock-based compensation								$ 307,710	$ 278,892	$ 203,619
Deferred tax asset related to stock-based compensation								61,000	54,400	39,700
Tax benefit from compensation expense								$ 83,400	59,500	49,700
401(k) Benefit Plan [Abstract]
Maximum annual contribution per employee (as a percent)								90.00%
Contribution per dollar of employee contribution								50.00%
Matching percent								3.00%
Defined Contribution Plan, Cost								$ 15,400	14,400	13,000
Market performance stock units and company performance stock units, change in control modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation				$ 0
Maximum percentage of market and service condition stock units that will ultimately vest with change of control (percent)				200.00%
Non-vested stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation								$ 295,100	266,500	193,800
Non-vested stock unit awards granted to senior level employees (shares) \| shares								2,728,869
Fair value of awards released								$ 260,000	246,700	149,300
Total unrecognized compensation cost related to stock-based compensation	$ 416,300							$ 416,300
Total unrecognized compensation cost recognition period (in years)								1 year 6 months 29 days
Non-vested stock \| Annual vesting on each anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage								33.33%
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation								$ 50,500	$ 40,200	$ 17,900
Period for final payout after vesting date		60 days
Period to determine actual stock grant following end of performance period			60 days		60 days	60 days	60 days
Maximum percentage of market and service condition stock units that will ultimately vest		125.00%	200.00%		200.00%		200.00%
Performance stock units \| Award Vesting December 31, 2020 (Percent)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	50.00%
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance under the Plans (shares) \| shares	17,937,529							17,937,529
Shares available for grant under the Plan (shares) \| shares	12,703,071							12,703,071
2014 Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fungible share factor										2.75
Shares authorized for issuance under the Plan (shares) \| shares											51,300,000
2014 Plan \| Non-vested stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares per non-vested stock unit \| shares								1
Share-based compensation award, stock vesting period, monthly installments \| installment									12
2015 ESPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares) \| shares	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 (shares) \| shares								12,000
Employee Stock Purchase Plan, lower of purchase price offered on either first or last day of payment period as a percentage of fair market value (percent)								85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock								5.00%
Employee Stock Purchase Plan, total shares issued under plan (shares) \| shares	2,675,657							2,675,657
Stock-based compensation										$ 9,800
2015 ESPP Plan \| Minimum
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 Plan \| Maximum
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%
Employee Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation								$ 12,600	$ 12,400
Senior Level Employees \| Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares) \| shares		90,756	294,605		293,991	93,500	268,729