Stock-Based Compensation - RSU and PSU Activity Tables (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock units
RSU & PSU Outstanding Roll forwards
Units outstanding	358,683	467,129	592,349
Granted	109,998	128,860	117,614
Forfeited	(24,965)	(12,466)	(48,974)
Vested	(173,664)	(224,840)	(193,860)
Units outstanding	270,052	358,683	467,129
Weighted Average Grant Date Fair Value
Grant date fair value of units outstanding	$ 22.22	$ 13.76	$ 9.86
Granted	59.16	35.14	25.98
Forfeited	33.24	22.88	13.57
Vested	13.73	12.02	9.31
Grant date fair value of units outstanding	$ 41.70	$ 22.22	$ 13.76
Performance Stock Units
RSU & PSU Outstanding Roll forwards
Units outstanding	87,109	0	132,992
Granted	34,088	88,345	0
Forfeited	(31,177)	(1,236)	(132,992)
Vested	0	0	0
Units outstanding	90,020	87,109	0
Weighted Average Grant Date Fair Value
Grant date fair value of units outstanding	$ 37.79	$ 0	$ 8.68
Granted	86.29	37.79	0
Forfeited	40.95	37.79	8.68
Vested	0	0	0
Grant date fair value of units outstanding	$ 55.06	$ 37.79	$ 0

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-SubTopic 10
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The number of grants made 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 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 non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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