Intrinsic value of equity-based compensation awards exercisable. Excludes stock and unit options.

No definition available.

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

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No definition available.

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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 equity instruments other than options outstanding and currently exercisable under the stock option plan.

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No definition available.

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Weighted average remaining contractual term for vested portions of equity instruments other than options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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No definition available.

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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 exercised during the period.

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

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

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-Publisher FASB
-Name Accounting Standards Codification
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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 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 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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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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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- References

No definition available.

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- Definition

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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Net 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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- Definition

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

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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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No definition available.

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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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No definition available.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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No definition available.

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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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No definition available.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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No definition available.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of new stock issued during the period.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation - Liability-Classified Stock Compensation Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 25, 2001
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award plan, number of common stock that may be issued				500,000
2001 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award plan, number of common stock that may be issued	500,000
Stock Options, Shares
Stock based compensation, Shares Outstanding, beginning balance	18,000	35,300	53,800
Stock based compensation, Shares, Granted	0	0	0
Stock based compensation, Shares, Exercised	0	(3,300)	(18,500)
Stock based compensation, Shares, Expired	(3,000)
Forfeited	(4,000)	(14,000)
Stock based compensation, Shares Outstanding, ending balance	11,000	18,000	35,300
Stock based compensation, Shares, Exercisable	11,000
Stock Options, Weighted Average Fair Value
Stock based compensation, Weighted Average Exercise Price, beginning balance	$ 64.69	$ 62.47	$ 53.99
Stock based compensation, Weighted Average Exercise Price, Exercised		33.16	37.80
Stock based compensation, Weighted Average Exercise Price, Expired	67.27
Stock based compensation, Weighted Average Exercise Price, Forfeited	64.99	66.54
Stock based compensation, Weighted Average Exercise Price, ending balance	63.87	$ 64.69	$ 62.47
Stock based compensation, Weighted Average Exercise Price, Exercisable	$ 63.87
Stock Options, Weighted Average Remaining Contractual Term
Stock based compensation, Weighted Average Remaining Contractual Term, Outstanding	7 months 10 days
Stock based compensation, Weighted Average Remaining Contractual Term, Exercisable	7 months 10 days
Stock based compensation, Aggregate Intrinsic Value, Outstanding	$ 4,140
Stock based compensation, Aggregate Intrinsic Value, Exercisable	$ 4,140
2001 Plan [Member] \| Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of new stock options issued under 2001 plan	0
2001 Plan [Member] \| Stock Appreciation Rights [Member]
Share-based Compensation, Other Than Options, Shares
Stock based compensation, Shares Outstanding, beginning balance	18,000	35,300	53,800
Stock based compensation, Shares, Granted	0	0	0
Stock based compensation, Shares, Exercised	0	(3,300)	(18,500)
Stock based compensation, Shares, Expired	(3,000)
Stock based compensation, Shares, Forfeited	(4,000)	(14,000)
Stock based compensation, Shares Outstanding, ending balance	11,000	18,000	35,300
Stock based compensation, Shares, Exercisable	11,000
Share-based Compensation, Other Than Options, Weighted Average Fair Value
Stock based compensation, Weighted Average Fair Value Per Share, beginning balance	$ 2.64	$ 5.56	$ 1.61
Stock based compensation, Weighted Average Fair Value Per Share, Exercised		12.19	11.20
Stock based compensation, Weighted Average Fair Value Per Share, Forfeited	0.87	4.84
Stock based compensation, Weighted Average Fair Value Per Share, ending balance	1.33	$ 2.64	$ 5.56
Stock based compensation, Weighted Average Fair Value Per Share, Exercisable	$ 1.33
Share-based Compensation, Other Than Options, Weighted Average Remaining Contractual Term
Share based compensation, Weighted Average Remaining Contractual Term, Outstanding	7 months 10 days
Share based compensation, Weighted Average Remaining Contractual Term, Exercisable	7 months 10 days
Share-based Compensation, Other Than Options, Aggregate Intrinsic Value
Share based compensation, Aggregate Intrinsic Value, Outstanding	$ 2,229
Share based compensation, Aggregate Intrinsic Value, Exercisable	$ 2,229