Options and Awards Subsidiary Common Stock Shares and Restricted Stock (Details) - $ / shares shares in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Class of Stock [Line Items]
Nonvested Restricted Awards, Granted	105	57
Weighted Average Grant Date Fair Value, Restricted Awards Granted in the Period	$ 51.15
Nonvested Restricted Awards, Vested in the Period	(97)
Award Vesting Period	5 years
Options Granted	141	168
Subsidiaries Stock awards [Member] \| Subsidiaries [Member]
Class of Stock [Line Items]
Common Stock Required to Settle Subsidiary Shares	164	223
Nonvested Restricted Awards, Granted	0	0
Nonvested Restricted Awards, Vested in the Period	0	0
Options Granted	0	0
Minimum [Member] \| Subsidiaries Stock awards [Member] \| Subsidiaries [Member]
Class of Stock [Line Items]
Award Vesting Period	3 years
Maximum [Member] \| Subsidiaries Stock awards [Member] \| Subsidiaries [Member]
Class of Stock [Line Items]
Award Vesting Period	5 years

Common Stock Required to Settle Subsidiary Shares

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Gross number of share options (or share units) granted 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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