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Stock-Based Compensation Plans (Details 3) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) period shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Oct. 31, 1996 shares
Additional disclosures |  |  |  |
Stock-based compensation expense | $ 19,707 | $ 17,085 | $ 14,666 |
Capitalized stock-based compensation cost | $ 10,208 | 9,474 | 9,266 |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Shares issued under Employee Stock Purchase Plan | shares | 12,955 |  |  |
Stock-based compensation expense | $ 19,707 | $ 17,085 | 14,666 |
Stock Options |  |  |  |
Additional disclosures |  |  |  |
Forfeiture rate (as a percent) | 0.60% | 0.70% |  |
Performance awards |  |  |  |
Additional disclosures |  |  |  |
Maximum Measurement Period (in years) | 3 years |  |  |
Award vesting period (in years) | 3 years |  |  |
Performance awards | Maximum |  |  |  |
Additional disclosures |  |  |  |
Percentage of stock based compensation elected to be received in the form of stock options upon the election of the recipient | 25.00% |  |  |
Restricted Stock and Restricted Stock Units |  |  |  |
Additional disclosures |  |  |  |
Unrecognized compensation cost for unvested stock options | $ 28,116 |  |  |
Weighted average period for recognition of unrecognized compensation cost | 2 years 6 months |  |  |
Non Qualified Employee Stock Purchase Plan |  |  |  |
Additional disclosures |  |  |  |
Stock-based compensation expense | $ 436 | $ 418 | $ 289 |
Employee Stock Purchase Plan [Abstract] |  |  |  |
Employee stock purchase plan, shares of common stock reserved for issuance | shares |  |  |  | 1,000,000
Employee stock purchase plan, remaining shares of common stock available for issuance | shares | 668,329 |  |  |
Employment period of full-time employees for becoming eligible to participate in the plan (in months) | 1 month |  |  |
Number of purchase periods | period | 2 |  |  |
Employee stock purchase plan, discounted stock price percentage | 85.00% |  |  |
Shares issued under Employee Stock Purchase Plan | shares | 12,955 | 11,528 | 11,348 |
Stock-based compensation expense | $ 436 | $ 418 | $ 289 |

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- Definition Estimated period over which a full-time employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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