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Share-Based Compensation - Additional Information (Details) | 12 Months Ended | 72 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) compensation_plan $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Apr. 12, 2011 offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of compensation plans | compensation_plan | 2 |  |  |  |
Stock-based compensation expense | $ | $ 3,542,000 | $ 3,080,000 | $ 2,607,000 |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares | $ 30.30 | $ 8.24 | $ 6.81 |  |
Period of expense of unrecognized compensation cost, years | 4 years | 4 years | 4 years |  |
Equity Incentive Stock Option Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for future issuance | 4,258,000 |  |  | 4,258,000 |
Shares available for future grant | 1,797,000 |  |  | 1,797,000 |
Maximum term of grants | 10 years |  |  |  |
Options vested and exercisable, period, in years | 5 years |  |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) | $ / shares | $ 6.64 | $ 8.24 | $ 6.81 |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 252,000 | $ 109,000 | $ 28,000 |  |
Shares granted during period | 25,000 | 14,000 | 6,000 |  |
Weighted average grant-date fair value of restricted stock granted (in dollars per share) | $ / shares | $ 30.30 | $ 28.02 | $ 23.50 |  |
Employee Stock Purchase Plan (ESPP) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 509,000 | $ 375,000 | $ 562,000 |  |
Shares available for future grant | 2,362,000 |  |  | 2,362,000 |
Continuous years of service | 2 years |  |  |  |
Number of additional offerings | offering |  |  |  |  | 5
Stock options authorized to issue to employees | 4,050,000 |  |  | 4,050,000 |
Annual earnings withheld to purchase common stock | $ | $ 21,250 |  |  | $ 21,250 |
Percent of IRS limitation | 85.00% |  |  | 85.00% |
Maximum fair value of common stock purchased | $ | $ 25,000 |  |  | $ 25,000 |
Percentage of stock purchase price | 85.00% |  |  |  |
SERP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ | $ 538,000 | $ 497,000 | $ 538,000 |  |
Percentage of match participants' deferrals | 25.00% |  |  |  |
Percentage of earned income on a pre-tax basis, deferred | 25.00% |  |  | 25.00% |
Percentage of deferral in the form of common stock | 15.00% |  |  | 15.00% |
Full vest in matching contribution | 3 years |  |  |  |
Stock options authorized to issue | 1,013,000 |  |  | 1,013,000 |
Common stock reserved for future issuance | 421,000 |  |  | 421,000 |
Shares exercised and delivered | 15,000 |  |  | 15,000 |
Shares issued to trustee | 15,000 | 16,000 | 19,000 | 591,000 |
Stock options vested and outstanding | 359,000 |  |  | 359,000 |

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -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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