Number of Board of Directors Members Granted Restricted Stock Awards

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grant Date Fair Value Per Non-Employee Director, Nonvested

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No definition available.

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- Definition

Stock Repurchase Program, Additional Authorized Repurchase Amount

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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.

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- Definition

The cash outflow to reacquire common stock during the period.

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- Definition

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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- 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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No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

Amount remaining of a stock repurchase plan authorized.

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No definition available.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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Number of shares of common and preferred stock retired from treasury during the period.

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Stockholders' Equity (Details)					1 Months Ended		2 Months Ended	12 Months Ended
Stockholders' Equity (Details)	Sep. 20, 2017 USD ($) shares	Jul. 11, 2017 USD ($) shares	Jul. 03, 2017 director shares	May 17, 2016 director shares	Dec. 31, 2017 USD ($) shares	Jul. 31, 2016 USD ($) shares	Feb. 26, 2018 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares	Sep. 18, 2017 USD ($)	Jul. 07, 2017 USD ($)	May 25, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period (in shares) \| shares	3,742,111	1,500,000
Payments for repurchase of common stock	$ 65,800,000	$ 27,000,000						$ 147,422,000	$ 14,820,000	$ 305,004,000
Additional authorized repurchase amount											$ 66,000,000.0	$ 28,000,000.0
Remaining authorized repurchase amount					$ 136,300,000			136,300,000
Treasury stock, shares, retired (in shares) \| shares					8,450,294	17,998,658
Retirement of treasury stock					$ 147,400,000	$ 320,100,000
Restricted stock awards expense (less than)								76,000	131,000	$ 150,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount approved granting to each non-employee director													$ 50,000
Number of restricted stock awards issued (in shares) \| shares			5,334	8,919
Number of Board of Directors members granted restricted stock awards \| director			2	3
Restricted stock awards expense (less than)								$ 100,000	$ 100,000
August 17, 2016 \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25.00%
November 17, 2016 \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25.00%
February 17, 2017 \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				25.00%
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period (in shares) \| shares							564,555
Payments for repurchase of common stock							$ 10,100,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares repurchased during the period (in shares) \| shares								8,450,294	995,650	16,982,739
Average purchase price per share for share repurchase (in dollars per share) \| $ / shares								$ 17.46	$ 14.88
Retirement of treasury stock								$ 147,422,000	$ 320,109,000