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Stockholders' Equity (Narrative) (Details) (USD $) | 0 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 0 Months Ended |
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May 08, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | May 08, 2014 | Jun. 30, 2014 Stock Options | Jun. 30, 2013 Stock Options | Jun. 30, 2014 Restricted Stock | Jun. 30, 2014 2002 Stock Incentive Plan Stock Options | Jun. 30, 2014 Employee Stock Purchase Plan | Jun. 30, 2013 Employee Stock Purchase Plan | Jun. 30, 2014 Employee Stock Purchase Plan Stock Options | Jun. 30, 2013 Employee Stock Purchase Plan Stock Options | Jun. 30, 2014 Certain Directors 2002 Stock Incentive Plan | Jun. 30, 2014 Employees | Jun. 30, 2014 Vesting Period One 2002 Stock Incentive Plan Stock Options | Jun. 30, 2014 Vesting Period Two 2002 Stock Incentive Plan Stock Options | Jul. 17, 2014 Subsequent Event | Jul. 17, 2014 Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award Vesting Period |  |  |  |  |  |  | 3 years |  |  |  |  |  | 1 year | 4 years | 6 months | 42 months |  |
Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% | 2.08% |  |
Award Vesting Rights |  |  |  |  | 1/8 on the six month anniversary of the date of grant, and 1/48 each month thereafter for 42 months |  |  |  |  |  |  |  |  |  |  |  |  |
Award Expiration Period |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of stock options |  |  |  |  | $ 47.44 |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  |  |  | $ 13,700,000 | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period in which cost is expected to be recognized |  |  |  |  | 2 years 6 months 15 days |  | 1 year 8 months 16 days |  |  |  |  |  |  |  |  |  |  |
Net proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  | 3,600,000 | 1,100,000 |  |  |  |  |  |
Shares available for future option grants |  |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost, restricted stock |  |  |  |  |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares allowed to purchase in employee stock purchase plan |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |  |  |  |  |
Offering period of shares in employee stock purchase plan |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Percentage of purchase price of stock |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Shares issued in period |  |  |  |  |  |  |  |  | 2,230 | 5,016 |  |  |  |  |  |  |  |
Stock-based compensation |  | 5,093,000 | 2,616,000 |  |  |  |  |  | 30,627 | 26,000 |  |  |  |  |  |  |  |
Shares available for future purchases |  |  |  |  |  |  |  |  | 77,285 |  |  |  |  |  |  |  |  |
Corporate Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, authorized amount |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000
Stock repurchase, maximum period | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |

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- Definition Number of shares to be repurchased in accordance with a policy to use treasury stock to satisfy share-award conversions. + 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 (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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 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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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- 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 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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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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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