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Stock-Based Compensation - Stock Options and Restricted Stock Narrative (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 10, 2016 | Jan. 01, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Proceeds from stock options exercised |  |  | $ 1,712 | $ 8,122 | $ 12,371
Tax benefit from stock options exercised |  |  | $ 500 | $ 3,100 | $ 2,300
Options granted (in shares) |  |  | 77,000 | 133,000 | 201,000
Restricted stock granted (in shares) |  |  | 138,000 | 155,000 | 196,000
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Modification expense |  |  | $ 0 | $ 0 | $ 0
Unrecognized pre-tax stock-based compensation expense |  |  | $ 2,100 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  | 1 year 9 months 18 days |  |
Stock options | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Stock options | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 4 years |  |
Non-vested restricted stock award |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax stock-based compensation expense |  |  | $ 10,700 |  |
Unrecognized pre-tax stock-based compensation expense, period for recognition |  |  | 2 years 1 month 6 days |  |
Non-vested restricted stock award | Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Non-vested restricted stock award | Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Subsequent event | Certain Executive Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) |  | 93,135 |  |  |
Subsequent event | Non-executives [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 150,000 |  |  |  |
Subsequent event | Stock options | Certain Executive Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Options grant date fair value |  | $ 1,800 |  |  |
Subsequent event | Stock options | Certain Executive Employees | Percent Vesting on January 1, 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage |  | 33.33% |  |  |
Subsequent event | Stock options | Certain Executive Employees | Quarterly Vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage |  | 8.33% |  |  |
Subsequent event | Stock options | Non-executives [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period | 3 years |  |  |  |
Options grant date fair value | $ 2,600 |  |  |  |
Subsequent event | Stock options | Non-executives [Member] | Percent Vesting on February 10, 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage | 33.33% |  |  |  |
Subsequent event | Non-vested restricted stock award | Certain Executive Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Restricted stock granted (in shares) |  | 34,060 |  |  |
Restricted stock, grant date fair value (in dollars per share) |  | $ 1,800 |  |  |
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on January 1, 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage |  | 33.33% |  |  |
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Quarterly Vesting |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage |  | 8.33% |  |  |

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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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