Options and Awards Restricted Award Rollforward (Details) - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restricted Stock Rollforward [Line Items]
Nonvested Restricted Awards, Nonvested at January 1,			383
Weighted Average Grant Date Fair Value, Nonvested at January 1,			$ 20.65
Nonvested Restricted Awards, Granted	42	41	316	140
Weighted Average Grant Date Fair Value, Restricted Awards Granted in the Period			$ 34.79
Nonvested Restricted Awards, Vested in the Period			(125)
Weighted Average Grant Date Fair Value, Restricted Awards Vested in the Period			$ 22.25
Nonvested Restricted Awards, Forfeited in the Period			(14)
Weighted Average Grant Date Fair Value, Restricted Awards Forfeited in the Period			$ 22.98
Nonvested Restricted Awards, Nonvested at September 30,	560		560
Weighted Average Grant Date Fair Value, Nonvested at September 30,	$ 28.21		$ 28.21

[Line Items] for Restricted Stock Rollforward [Table]

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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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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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Number of shares related to Restricted Stock Award forfeited during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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