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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended | 44 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | May 09, 2012
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 0 |  |  |  |
Stock repurchase program authorized share amount (in shares) | 15,000,000 |  |  | 15,000,000 |
Common stock repurchased (in shares) |  | 2,000 | 1,000 | 11,521,000 |
Common stock repurchased, value |  |  |  | $ 335,455 |
Total intrinsic value of options exercised | $ 7,252 | $ 6,613 | $ 20,101 |  |
Weighted average remaining life | 4 years 8 months 12 days |  |  |  |
Stock Options Plans [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 0 | 0 | 0 |  |
Recognized stock-based compensation costs | $ 209 | $ 865 | $ 1 |  |
Recognized stock-based compensation costs, net of tax | 131 | 548 | 1 |  |
Pre-tax unrecognized compensation expense | $ 36 |  |  | 36 |
Weighted average remaining life | 7 months 24 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Recognized stock-based compensation costs | $ 32,343 | 27,096 | 16,945 |  |
Recognized stock-based compensation costs, net of tax | 20,832 | $ 17,165 | $ 10,735 |  |
Pre-tax unrecognized compensation expense | $ 31,416 |  |  | $ 31,416 |
Recognized expense over a weighted-average period, years | 1 year 11 months 5 days |  |  |  |
2012 Long-term Incentive Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Expiration year | Dec. 31, 2022 |  |  |  |
2012 Long-term Incentive Plan [Member] | Stock Options Plans [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Option awards contractual term (years) | 10 years |  |  |  |
2012 Long-term Incentive Plan [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  |  | 3,200,000
2012 Long-term Incentive Plan [Member] | Maximum [Member] | Stock Options Plans [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 5 years |  |  |  |
2012 Long-term Incentive Plan [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 5 years |  |  |  |
2012 Long-term Incentive Plan [Member] | Minimum [Member] | Stock Options Plans [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |
2012 Long-term Incentive Plan [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Vesting period (years) | 3 years |  |  |  |
Non-Employee Director [Member] |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award [Line Items] |  |  |  |  |
Options granted (in shares) | 1 | 0 | 3,000 |  |

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