Class of Warrant or Right, Business Combination, Acquiring Person Discount

No definition available.

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- Definition

Class of Warrant or Right, Dividend Distribution, Number of Rights per Outstanding Share of Common Stock

+ References

No definition available.

+ Details

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- Definition

Class of Warrant or Right, Exercise Price Percentage in Event Rights Permit Stockholder Other Than Acquiring Person to Purchase

+ References

No definition available.

+ Details

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- Definition

Class of Warrant or Right, Percentage Acquistion of Company's Common Stock Causing Warrants or Rights to Become Exercisable

+ References

No definition available.

+ Details

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- Definition

Class of Warrant or Right, Percentage Acquistion of Company's Common Stock From Tender Offer Causing Warrants or Rights to Become Exercisable

+ References

No definition available.

+ Details

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- Details

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- Definition

Discount rate.

+ References

No definition available.

+ Details

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- Details

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- Definition

Percentage of purchase price of stock.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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- Definition

Share based compensation arrangement by share based payment award length of each offering.

+ References

No definition available.

+ Details

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- Details

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Subparagraph 2

-Article 4

+ Details

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

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Period Type:	instant

- Definition

Number of shares to be repurchased in accordance with a policy to use treasury stock to satisfy share-award conversions.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- 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

+ Details

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

+ Details

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- Details

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

+ Details

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Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration

- 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.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

+ Details

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Data Type:	xbrli:sharesItemType
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Period Type:	instant

- 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.

+ References

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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Period Type:	instant

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Period Type:	duration

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
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- Details

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- Details

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Stockholders' Equity (Details Textual) (USD $)	12 Months Ended			0 Months Ended
Stockholders' Equity (Details Textual) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 31, 2012	May 29, 2009	Aug. 31, 2014
Employee Stock Purchase Plan [Abstract]
Stock-based compensation expense	$ 11,270,000us-gaap_ShareBasedCompensation	$ 5,666,000us-gaap_ShareBasedCompensation	$ 4,067,000us-gaap_ShareBasedCompensation
Preferred Stock [Abstract]
Preferred stock authorized (shares)	5,000,000us-gaap_PreferredStockSharesAuthorized
Shareholder Rights Plan and Warrants [Abstract]
Exercise price per share of warrants						$ 125.08
Warrants to purchase number of shares						3,264,643
Public Offering [Abstract]
Common Stock, Shares, Issued	19,575,150us-gaap_CommonStockSharesIssued	20,468,521us-gaap_CommonStockSharesIssued
Proceeds from issuance of common stock, net	0	0	5,313,000
Corporate Share Repurchase [Abstract]
Stock Repurchase Program, Authorized Amount						200,000,000.0
Stock Repurchased During Period, Shares	1,253,425
Treasury Stock Acquired, Average Cost Per Share	$ 54.20
Stock Repurchased During Period, Value	67,955,000
Public Offering
Public Offering [Abstract]
Common Stock, Shares, Issued	0	302,750
Stock issued, weighted average price per share		$ 18.87
At the Market Equity Offering Program
Public Offering [Abstract]
Proceeds from issuance of common stock, net		5,500,000
2006 Stockholder Rights Plan
Shareholder Rights Plan and Warrants [Abstract]
Number of rights per outstanding share of common stock	1
Exercise price per share of warrants	$ 100
Percentage acquisition of company's common stock causing warrants or rights to become exercisable	20.00%
Percentage acquisition of company's common stock from tender offer causing warrants or rights to become exercisable	20.00%
Business combination, acquiring person discount (percent)	50.00%
Warrants to purchase number of shares	0.001
Warrants to purchase shares, stockholder other than acquiring person, exercise price percentage	200.00%
Series A Preferred Stock
Preferred Stock [Abstract]
Preferred stock authorized (shares)	1,600,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value per share of stock options	$ 46.20	$ 14.28	$ 9.13
Intrinsic value of options exercised	15,300,000	5,900,000	500,000
Unrecognized compensation cost	13,200,000
Weighted-average period in which cost is expected to be recognized	2 years 2 months 9 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Weighted-average period in which cost is expected to be recognized	1 year 3 months 11 days
Unrecognized compensation cost, restricted stock	1,900,000
2002 Stock Incentive Plan \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
2002 Stock Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase the number of shares under the 2002 Stock Incentive Plan				1,800,000	1,300,000
Shares available for future option grants	1,100,000
Award expiration period	10 years
2002 Stock Incentive Plan \| Stock Options \| Vest 1/8 on the six month anniversary of the date of grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	6 months
Award vesting right percentage	12.50%
2002 Stock Incentive Plan \| Stock Options \| Vest 1/48 each month for forty-two months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	42 months
Award vesting right percentage	2.08%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period	6 months
Employee Stock Purchase Plan [Abstract]
Shares allowed to purchase in employee stock purchase plan	1,250
Offering period of shares in employee stock purchase plan	6 months
Percentage lesser of fair market value taken as purchase price of share	85.00%
Discount rate	15.00%
Common stock issued under amended ESSP (shares)	3,774	5,016	10,763
Stock-based compensation expense	54,000	45,000	38,000
Revenue volatility (percent)	40.00%	36.00%	34.00%
Shares issued under employee stock purchase plan	212,447
Shares available for future purchases	75,741
Employee Stock Purchase Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from options exercised	$ 4,400,000	$ 3,000,000	$ 1,000,000