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Stockholders' Equity and Stock Plans - Options Outstanding by Price Range (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 425,700 | 517,936 | 363,578
Stock Options Outstanding, Remaining Contractual Life | 5 years 10 months 6 days | 5 years 4 months 2 days | 5 years 9 months 7 days
Weighted Average Exercise Price (usd per share) | $ 25.01 | $ 20.42 | $ 20.60
$0.00 - $10.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of Exercise Prices, Lower Limit (usd per share) | 0.00 |  |
Range of Exercise Prices, Upper Limit (usd per share) | 10.00 |  |
$10.01 - $20.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of Exercise Prices, Lower Limit (usd per share) | 10.00 |  |
Range of Exercise Prices, Upper Limit (usd per share) | 20.00 |  |
$20.01 - $30.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of Exercise Prices, Lower Limit (usd per share) | 20.01 |  |
Range of Exercise Prices, Upper Limit (usd per share) | 30.00 |  |
$30.01 - $40.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of Exercise Prices, Lower Limit (usd per share) | 30.01 |  |
Range of Exercise Prices, Upper Limit (usd per share) | 40.00 |  |
$40.01 - $50.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of Exercise Prices, Lower Limit (usd per share) | 40.01 |  |
Range of Exercise Prices, Upper Limit (usd per share) | $ 50.00 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 425,700 |  |
Stock Options Outstanding, Remaining Contractual Life |  |  |
Stock Options Exercisable (in shares) | 311,050 |  |
Stock options | $0.00 - $10.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 4,604 |  |
Stock Options Outstanding, Remaining Contractual Life | 3 years 1 month 6 days |  |
Weighted Average Exercise Price (usd per share) | $ 8.96 |  |
Stock Options Exercisable (in shares) | 4,604 |  |
Stock Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 8.96 |  |
Stock options | $10.01 - $20.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 110,394 |  |
Stock Options Outstanding, Remaining Contractual Life | 2 years 3 months 18 days |  |
Weighted Average Exercise Price (usd per share) | $ 16.94 |  |
Stock Options Exercisable (in shares) | 110,394 |  |
Stock Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 16.94 |  |
Stock options | $20.01 - $30.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 179,828 |  |
Stock Options Outstanding, Remaining Contractual Life | 6 years |  |
Weighted Average Exercise Price (usd per share) | $ 23.73 |  |
Stock Options Exercisable (in shares) | 151,808 |  |
Stock Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 23.63 |  |
Stock options | $30.01 - $40.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 127,040 |  |
Stock Options Outstanding, Remaining Contractual Life | 8 years 9 months 18 days |  |
Weighted Average Exercise Price (usd per share) | $ 33.94 |  |
Stock Options Exercisable (in shares) | 40,410 |  |
Stock Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 33.78 |  |
Stock options | $40.01 - $50.00 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock Options Outstanding (in shares) | 3,834 |  |
Stock Options Outstanding, Remaining Contractual Life | 9 years 6 months |  |
Weighted Average Exercise Price (usd per share) | $ 40.70 |  |
Stock Options Exercisable (in shares) | 3,834 |  |
Stock Options Exercisable, Weighted Average Exercise Price (usd per share) | $ 40.70 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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