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Number of stock-based compensation plans offered

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Employee Stock-Based Compensation and Benefit Plans (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended	12 Months Ended
	Aug. 01, 2017 shares	Mar. 31, 2018 shares	Mar. 31, 2017 $ / shares shares	Mar. 31, 2016 $ / shares shares	Jan. 31, 2016 $ / shares shares	Mar. 31, 2018	Dec. 31, 2018 USD ($) installment plan $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered \| plan							1
Stock-based compensation \| $							$ 203,619	$ 165,120	$ 152,739
Deferred tax asset related to stock-based compensation \| $							39,700	46,100	53,500
Tax benefit from compensation expense \| $							$ 49,700	72,900	64,700
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 \| $							$ 13,000	13,700	14,000
Market and service condition stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)			275,148	234,816
Performance period			3 years
Total return to shareholders as percentile of peer group, minimum			41.00%
Total return to shareholders as percentile of peer group, maximum			80.00%
Maximum share cap based on target shareholder return (percent)			100.00%
Minimum share cap based on target shareholder return (percent)			200.00%
Minimum peer group percentile to achieve target share cap			80.00%
Period to determine actual stock grant following end of interim measurement period			60 days
Non-vested stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation \| $							$ 193,800	149,800	135,700
Non-vested stock unit awards granted to senior level employees (shares)							3,903,225
Expected volatility rate, calculation basis, period			2 years 9 months			3 years
Granted (in dollars per share) \| $ / shares			$ 104.05	$ 66.18	$ 49.68		$ 92.20
Share-based compensation award, stock vesting period, monthly installments \| installment							12
Fair value of awards released \| $							$ 149,300	$ 150,000	163,800
Total unrecognized compensation cost related to stock-based compensation \| $							$ 376,700
Total unrecognized compensation cost recognition period (in years)							1 year 9 months 5 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%
Non-vested stock (Modified)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate, calculation basis, period			1 year 22 days
Granted (in dollars per share) \| $ / shares			$ 99.54
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period				3 years
Maximum target shareholder return (percent)				10.00%
Maximum share cap based on target shareholder return (percent)				100.00%
Minimum target shareholder return (percent)				5.00%
Minimum share cap based on target shareholder return (percent)				200.00%
Target shareholder return maximum to attain 200% (percent)				30.00%
Period to determine actual stock grant following end of interim measurement period				60 days
Interim measurement period				18 months
Share cap based on interim measurement period (percent)				33.00%
Period to determine actual stock grant following end of performance period	60 days	60 days		60 days
Maximum percentage of market and service condition stock units that will ultimately vest	200.00%	200.00%
Superseded Stock Plans \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period							5 years
Superseded Stock Plans \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period							10 years
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)							46,000,000
Shares reserved for issuance under the Plans (shares)							20,837,415
Shares available for grant under the 2014 Equity Incentive Plan (shares)							14,935,686
2015 ESPP Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)							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)							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)							1,721,924
Stock-based compensation \| $									$ 7,500
Expected volatility rate, calculation basis, period							6 months	6 months	6 months
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 \| $							$ 9,800	$ 10,000
Chief Executive Officer \| 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)					220,235
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)	184,322	268,729