Share based compensation arrangement by share based payment award number of common stock reserved for issuance.

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- Definition

Share based compensation arrangement by share based payment award option awards contractual term.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-SubTopic 10
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- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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-Publisher FASB
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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

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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.

+ References

No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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- Definition

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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- Definition

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

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended			56 Months Ended
	May 19, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	May 09, 2012
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Options granted (in shares)		0
Number of shares authorized to be repurchased		15,000,000
Common stock repurchased (in shares)		0	0	0	11,521,000
Common stock repurchased, value					$ 335,455
Total intrinsic value of options exercised		$ 5,005	$ 10,571	$ 7,252
Stock Options Plans
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Recognized stock-based compensation costs		6	40	209
Recognized stock-based compensation costs, net of tax		4	24	131
Pre-tax unrecognized compensation expense		0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Recognized stock-based compensation costs		36,316	35,019	32,343
Recognized stock-based compensation costs, net of tax		22,037	$ 21,250	$ 20,832
Pre-tax unrecognized compensation expense		$ 25,286
Recognized expense over a weighted-average period, years		1 year 3 months 10 days
2012 Long-Term Incentive Plan
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Common stock reserved for issuance (in shares)						3,200,000
Expiration year		Dec. 31, 2022
Additional awards granted (in shares)	0
2012 Long-Term Incentive Plan \| Stock Options Plans
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Option awards contractual term (years)		10 years
2012 Long-Term Incentive Plan \| Minimum \| Stock Options Plans
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period (years)		3 years
2012 Long-Term Incentive Plan \| Minimum \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period (years)		3 years
2012 Long-Term Incentive Plan \| Maximum \| Stock Options Plans
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period (years)		5 years
2012 Long-Term Incentive Plan \| Maximum \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Vesting period (years)		5 years
2017 Long-Term Incentive Plan
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	3,000
Awards granted (in shares)		0
Non-employee director
Share Based Compensation Arrangement by Share Based Payment Award [Line Items]
Options granted (in shares)		1,000	1,000	1,000