Own share lending arrangement shares returned.

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- Definition

Treasury stock shares surrendered in exercise of stock options.

+ References

No definition available.

+ Details

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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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

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 04
-Article 3

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

+ References

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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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-Publisher FASB
-Name Accounting Standards Codification
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Common Stock (Share-Based Compensation, Treasury Stock, and Stock Repurchase Plan) (Details) - USD ($)			12 Months Ended
	Dec. 31, 2014	Jan. 22, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2015	Nov. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash share-based compensation expense			$ 14,700,000	$ 10,500,000	$ 10,900,000
Common stock shares purchased as payment of income tax withholding			473,304	243,005	448,121
Stock surrendered for exercise of stock options, shares			106,810	46,208	237,267
Return of borrowed shares under share-based, shares		2,439,558			2,439,558	1,360,442
Treasury stock shares retired	5,873,291		0	5,873,291
Treasury stock shares retired, cost	$ 32,600,000
Common stock shares purchased, cost			$ 9,697,000	$ 10,395,000
Remaining authorized repurchase amount			$ 54,900,000
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares purchased as payment of income tax withholding			473,000	243,000	448,000
Stock surrendered for exercise of stock options, shares			107,000	46,000	237,000
Treasury stock shares retired				5,873,000
Treasury stock shares retired, cost	(32,600,000)			$ (32,568,000)
Common stock shares purchased by the company			800,000	621,000
Common stock shares purchased, cost			$ 9,697,000	$ 10,395,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock shares retired				5,873,000
Treasury stock shares retired, cost	1,000			$ 1,000
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock shares retired, cost	$ 32,600,000			$ 32,567,000
Share Repurchase Program, November 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase shares authorized								$ 25,000,000
Common stock shares purchased by the company			799,723	621,176
Common stock shares purchased, cost			$ 9,700,000	$ 10,400,000
Common stock shares purchased, average cost per share (in dollars per share)			$ 12.13	$ 16.74
Share Repurchase Program, June 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase shares authorized							$ 50,000,000