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Equity Awards - Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares
Additional information regarding share-based payment arrangements
Net cash proceeds related to stock options exercised | $		$ (8,600)
Aggregate intrinsic value of stock options exercised | $	$ 17,400	$ 11,300
Stock options
Schedule of stock option activity and other stock option information
Beginning Balance (in shares)	256,246	100,000	100,000
Awards assumed through acquisition of CEC (in shares)		319,846
Exercise of stock options, net (in shares)	(208,114)	(162,831)
Forfeitures/Expirations (in shares)	(2,036)	(769)
Ending Balance (in shares)	46,096	256,246	100,000	100,000
Exercisable (in shares)	24,246
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning Balance, Weighted-average exercise price (in dollars share) | $ / shares	$ 66.80	$ 51.95	$ 51.95
Awards assumed through acquisition of CEC, Weighted-average exercise price (in dollars share) | $ / shares		66.98
Exercises, Weighted-average exercise price (in dollars share) | $ / shares	67.61	$ 58.11
Forfeitures/Expirations, Weighted-average exercise price (in dollars share) | $ / shares	58.38	51.96
Ending Balance, Weighted-average exercise price (in dollars share) | $ / shares	$ 63.49	$ 66.80	$ 51.95	$ 51.95
Exercisable, Weighted-average exercise price (in dollars share) | $ / shares					$ 60.27
Weighted-average remaining contractual life (years)	5 years 2 months 12 days	7 years	3 years 1 month 6 days	4 years 1 month 6 days
Exercisable, Weighted-average remaining contractual life (years)	4 years
Aggregate intrinsic value | $					$ 4,398	$ 11,947	$ 3,763	$ 2,868
Exercisable, Aggregate intrinsic value | $					$ 2,391
Additional information regarding share-based payment arrangements
Stock options outstanding	46,096	256,246	100,000	100,000	46,096	256,246	100,000	100,000

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The number of equity based awards assumed through an acquisition during the reporting period.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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