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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 19, 2017 | May 09, 2012
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 0 |  |  |  |
Total intrinsic value of options exercised | $ 0 | $ 5,005 | $ 10,571 |  |
Stock Options Plans |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Recognized stock-based compensation costs | 0 | 6 | 40 |  |
Recognized stock-based compensation costs, net of tax | 0 | 4 | 24 |  |
Pre-tax unrecognized compensation expense | 0 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Recognized stock-based compensation costs | 31,382 | 36,316 | 35,019 |  |
Recognized stock-based compensation costs, net of tax | 24,436 | $ 22,037 | $ 21,250 |  |
Pre-tax unrecognized compensation expense | $ 20,834 |  |  |  |
Recognized expense over a weighted-average period, years | 1 year 3 months 4 days |  |  |  |
2012 Long-Term Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  | 3,200,000
Additional awards available to be granted (in shares) |  |  |  | 0 |
2012 Long-Term Incentive Plan | Stock Options Plans |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Option awards contractual term (years) | 10 years |  |  |  |
2012 Long-Term Incentive Plan | Minimum | Stock Options Plans |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |
2012 Long-Term Incentive Plan | Minimum | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |
2012 Long-Term Incentive Plan | Maximum | Stock Options Plans |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 5 years |  |  |  |
2012 Long-Term Incentive Plan | Maximum | Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 5 years |  |  |  |
2017 Long-Term Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 3,000 |
Non-employee director |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 1,000 | 1,000 | 1,000 |  |

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