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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended
--- | --- | ---
Jan. 08, 2016 | Jun. 30, 2016 | Jun. 30, 2015
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Net proceeds from employee stock purchase plan |  | $ 2.4 | $ 5.3
2002 Stock Incentive Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for future option grants |  | 948,729 |
Employee Stock Purchase Plan |  |  |
Employee Stock Purchase Plan |  |  |
Shares allowed to purchase in employee stock purchase plan |  | 1,250 |
Shares issued in period |  | 1,241 | 0
Shares available for future purchases |  | 71,126 |
OMT, Inc. |  |  |
Employee Stock Purchase Plan |  |  |
Common stock issued in acquisition (shares) | 790,163 |  |
20-day volume-weighted average price of common stock issued in acquisition (usd per share) | $ 107.66 |  |

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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 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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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