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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
May 24, 2016 | May 22, 2007 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized pre-tax compensation cost |  |  | $ 5,500 |  |
Weighted average recognition period (in years) |  |  | 2 years 6 months |  |
Total intrinsic value of options exercised during period |  |  | $ 4,300 | $ 7,000 |
Cash received from options exercised during period |  |  | $ 1,700 | $ 2,600 |
New Accounting Pronouncement, Early Adoption, Effect [Member] | Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ 150
1992 Stock Option Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock authorized to be issued under plan (in shares) |  |  | 14,900,000 |  |
Exercise price of shares granted may not be less than fair market value (percentage) |  |  | 85.00% |  |
2007 Long-Term Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock authorized to be issued under plan (in shares) | 400,000.0 | 3,281,250 |  |  |
Unrecognized pre-tax compensation cost |  |  | $ 7,200 |  |
Weighted average recognition period (in years) |  |  | 2 years |  |
2007 Long-Term Incentive Plan Employees [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price of shares granted may not be less than fair market value (percentage) |  | 100.00% |  |  |
2016 Long-Term Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock authorized to be issued under plan (in shares) | 3,800,000.0 |  |  |  |
Exercise price of shares granted may not be less than fair market value (percentage) | 100.00% |  |  |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercisable period |  |  | 2 years |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercisable period |  |  | 10 years |  |
Restricted Stock [Member] | 2007 Long-Term Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual vesting period |  |  | 20.00% |  |
All Other Options Granted [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual vesting period |  |  | 20.00% |  |
Director [Member] | Options Granted on or after May 25, 2004 [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Annual vesting period |  |  | 33.33% |  |

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