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Share-Based Compensation (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 28, 2016 employee shares | Mar. 30, 2011 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Incremental compensation cost from modification |  |  | $ 1,409 | $ 281 | $ 741
2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan |  | 2.50% |  |  |
Options converted into liability award (in shares) | shares | 1,117,380 |  |  |  |
Share-based compensation expense |  |  | 3,267 | 3,303 | 2,788
Share-based compensation related income tax benefits (expense) |  |  | 151 | 688 | (1,581)
Initial Public Offering, Special Award [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  |  |  |  | 210
Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation related to expired stock options in Additional paid-in capital |  |  | $ 750 | 206 | $ 2,077
Stock Option [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average period of stock options recognized |  |  | 3 months |  |
Stock Option [Member] | 2011 Equity Incentive Plan Award Modification [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of employees affected by plan modification | employee | 104 |  |  |  |
Incremental compensation cost from modification |  |  | $ 0 | $ 0 |
Outstanding units related to liability award (in shares) | shares |  |  | 605,821 | 933,399 |
Accumulated additional paid-in capital related to award modification |  |  | $ 5,865 | $ 5,820 |
Restricted Share Units [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average period of stock options recognized |  |  | 2 years |  |
Accrued Payroll and Other Liabilities [Member] | Stock Option [Member] | 2011 Equity Incentive Plan Award Modification [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred compensation related to award modification |  |  | $ 85 | $ 9 |
Second Anniversary Of Grant Date [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 40.00% |  |
Three Years Following The Grant Date [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Requisite service period |  |  | 3 years |  |
Third Anniversary of Grant Date [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fourth Anniversary of Grant Date [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |
Fifth Anniversary of Grant Date [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage |  |  | 20.00% |  |

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- Definition Percentage of total outstanding shares of the entity immediately follow the IPO that is authorized under equity incentive plan + 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 The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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