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Stock-Based Compensation Plans (Details 3) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2014 item | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Oct. 31, 1996 shares
Additional disclosures |  |  |  |  |
Stock-based compensation expense |  | $ 14,666 | $ 14,703 | $ 13,314 |
Capitalized stock-based compensation cost |  | $ 9,266 | 9,667 | 5,457 |
Employee Stock Purchase Plan [Abstract] |  |  |  |  |
Shares issued under Employee Stock Purchase Plan | shares |  | 11,348 |  |  |
Stock-based compensation expense |  | $ 14,666 | 14,703 | 13,314 |
Stock Options |  |  |  |  |
Additional disclosures |  |  |  |  |
Forfeiture rate (as a percent) |  | 0.80% |  |  |
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 [Member] |  |  |  |  |
Additional disclosures |  |  |  |  |
Unrecognized compensation cost for unvested stock options |  | $ 24,421 |  |  |
Weighted average period for recognition of unrecognized compensation cost |  | 3 years 6 months |  |  |
Non Qualified Employee Stock Purchase Plan [Member] |  |  |  |  |
Additional disclosures |  |  |  |  |
Stock-based compensation expense |  | $ 289 | $ 321 | $ 407 |
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 |  | 692,812 |  |  |
Employment period of full-time employees for becoming eligible to participate in the plan (in months) |  | 1 month |  |  |
Employment period of other employees for becoming eligible to participate in the plan (in months) |  | 12 months |  |  |
Number of purchase periods | item | 2 |  |  |  |
Employee stock purchase plan, discounted stock price percentage |  | 85.00% |  |  |
Shares issued under Employee Stock Purchase Plan | shares |  | 11,348 | 10,667 | 9,848 |
Stock-based compensation expense |  | $ 289 | $ 321 | $ 407 |

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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 Estimated period over which an other than 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 expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -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=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 Discount rate from fair value on purchase date that participants pay for shares. + 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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