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Equity-Based Compensation - Restricted Stock and RSUs to be Settled in Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock compensation expense	$ 52,484	$ 46,448	$ 42,843
Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares (in shares)	1,625	1,500	1,800
Granted, weighted average grant date fair value, per share (in usd per share)	$ 34.37	$ 37.06	$ 22.22
Awards vested (in shares)	1,370
Unrecognized compensation cost, related to unvested restricted stock, total	$ 45,500
Expected weighted average period to recognize compensation cost on RSUs to be settled in common stock (in years)	2 years 2 months 26 days
Restricted Stock and Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested (in shares)	1,400	1,500	1,400
Fair value of restricted stock, vested	$ 48,600	$ 55,600	$ 28,900
Non-cash stock compensation expense	$ 43,900	$ 41,000	$ 39,600
Share-based Compensation Award, Tranche One | Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in stock	2 years
Share-based Compensation Award, Tranche Two | Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in stock	3 years
Share-based Compensation Award, Tranche Three | Restricted Stock Units to be Settled in Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for RSUs to be settled in stock	5 years

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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