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Employee Benefits and Share-Based Compensation - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Aug. 02, 2016	Nov. 04, 2014
The 2016 Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares authorized for repurchase under stock repurchase programs					$ 50,000,000.0
2014 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares authorized for repurchase under stock repurchase programs						$ 50,000,000.0
2016 and 2014 Share Repurchase Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining value of shares authorized for repurchase under stock repurchase programs	$ 54,900,000		$ 54,900,000
Number of shares repurchased (in shares)	0	0	0	0
2009 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0		150,000
Weighted-average fair value of options granted (in dollars per share)		$ 26.03	$ 33.89	$ 26.21
Intrinsic value of options exercised	$ 16,800,000	$ 2,500,000	$ 30,800,000	$ 12,400,000
Unrecognized compensation cost of unvested stock options	43,800,000		$ 43,800,000
2009 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of compensation cost not yet recognized			2 years 7 months 6 days
2009 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of compensation cost not yet recognized			3 years
Unrecognized compensation cost	48,200,000		$ 48,200,000
2009 Plan | RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of compensation cost not yet recognized			10 months 24 days
Unrecognized compensation cost	1,200,000		$ 1,200,000
2009 Plan | PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period of compensation cost not yet recognized			1 year 6 months
Unrecognized compensation cost	8,600,000		$ 8,600,000
1997 Plan | ESPP shares available for future issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under ESPP (in shares)			156,000	217,000
Weighted-average price of shares purchased (in dollars per share)			$ 59.75	$ 43.51
Unrecognized compensation cost	$ 2,900,000		$ 2,900,000
Weighted average period of compensation cost not yet recognized			1 year 3 months 18 days

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