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Equity Awards - Stock Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Schedule of stock option activity and other stock option information
Exercise of stock options, net (in shares)		0	0
Additional information regarding share-based payment arrangements
Net cash proceeds related to stock options exercised | $	$ 8,648
Aggregate intrinsic value of stock options exercised | $	$ 11,300
Stock options exercised		0	0
Stock options
Schedule of stock option activity and other stock option information
Beginning Balance, Number of shares	100,000	100,000	100,000
Awards assumed through acquisition of CEC, Number of shares	319,846
Grants, Number of shares
Exercise of stock options, net (in shares)	(162,831)
Forfeitures/Expirations, Number of shares	(769)
Ending Balance, Number of shares	256,246	100,000	100,000	100,000
Exercisable, Number of shares	108,317
Beginning Balance, Weighted-average exercise price | $ / shares	$ 51.95	$ 51.95	$ 51.95
Awards assumed through acquisition of CEC, Weighted-average exercise price | $ / shares	66.98
Grants, Weighted-average exercise price | $ / shares
Exercises, Weighted-average exercise price | $ / shares	58.11
Forfeitures/Expirations, Weighted-average exercise price | $ / shares	51.96
Ending Balance, Weighted-average exercise price | $ / shares	66.80	$ 51.95	$ 51.95	$ 51.95
Exercisable, Weighted-average exercise price | $ / shares	$ 65.00
Weighted-average remaining contractual life (years)	7 years	3 years 1 month 6 days	4 years 1 month 6 days	5 years 1 month 6 days
Exercisable, Weighted-average remaining contractual life (years)	6 years 4 months 24 days
Beginning Balance, Aggregate intrinsic value | $	$ 3,763	$ 2,868	$ 817
Ending Balance, Aggregate intrinsic value | $	11,947	$ 3,763	$ 2,868	$ 817
Exercisable, Aggregate intrinsic value | $	$ 5,245
Additional information regarding share-based payment arrangements
Stock options exercised	162,831

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

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Weighted average of fair value as of the grant date of equity based award options that were assumed through an acquisition in the reporting period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation 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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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