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Stock Incentive Compensation and Employee Benefit Plans (Schedule of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
2001 Stock Incentive Plans and Nonemployee Directors |  |  |  |
Weighted options outstanding: |  |  |  |
Balance, Beginning of Period (shares) | 767,830 | 828,092 | 1,732,639 |
Options granted (in shares) | 0 | 0 | 0 |
Options forfeited (in shares) | 0 | 0 | 0 |
Options expired (in shares) | 0 | 0 | 0 |
Options exercised (in shares) | (359,618) | (60,262) | (904,547) |
Balance, End of Period (shares) | 408,212 | 767,830 | 828,092 | 1,732,639
Weighted average exercise price: |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 48.71 | $ 48.77 | $ 47.61 |
Options granted, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options forfeited, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options expired, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options exercised, Weighted average exercise price (In dollars per share) | 45.09 | 49.52 | 46.55 |
Weighted average exercise price, End of Period (In dollars per share) | $ 51.90 | $ 48.71 | $ 48.77 | $ 47.61
Weighted average remaining contractual life | 1 year 7 months 6 days | 2 years | 2 years 10 months 24 days | 3 years 8 months
Aggregate Intrinsic Value [Abstract] |  |  |  |
Aggregate intrinsic value | $ 25,020 | $ 37,246 | $ 40,221 | $ 58,305
Options exercised, Aggregate intrinsic value | $ 21,205 | $ 2,900 | $ 36,800 |
Range of Exercise Prices [Abstract] |  |  |  |
Exercise price range, lower range limit (In dollars per share) | $ 37.51 | $ 37.51 | $ 37.51 | $ 37.51
Exercise price range, upper range limit (In dollars per share) | 59.66 | $ 59.66 | $ 59.66 | $ 59.66
Total options exercisable, minimum (In dollars per share) | 42.66 |  |  |
Total options exercisable, maximum (In dollars per share) | $ 59.66 |  |  |
Total options exercisable (in shares) | 408,212 |  |  |
Total options exercisable, Weighted average exercise price (In dollars per share) | $ 51.90 |  |  |
Total options exercisable, Weighted average remaining contractual life | 1 year 7 months 6 days |  |  |
Total options exercisable, Aggregate intrinsic value | $ 25,020 |  |  |
Premium Option Plan |  |  |  |
Weighted options outstanding: |  |  |  |
Balance, Beginning of Period (shares) | 0 | 572,000 | 842,000 |
Options granted (in shares) | 0 | 0 | 0 |
Options forfeited (in shares) | 0 | 0 | 0 |
Options expired (in shares) | 0 | 0 | 0 |
Options exercised (in shares) | 0 | (572,000) | (270,000) |
Balance, End of Period (shares) | 0 | 0 | 572,000 | 842,000
Weighted average exercise price: |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 0.00 | $ 73.62 | $ 73.82 |
Options granted, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options forfeited, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options expired, Weighted average exercise price (In dollars per share) | 0.00 | 0.00 | 0.00 |
Options exercised, Weighted average exercise price (In dollars per share) | 0.00 | 73.62 | 74.24 |
Weighted average exercise price, End of Period (In dollars per share) | $ 0.00 | $ 0.00 | $ 73.62 | $ 73.82
Weighted average remaining contractual life | 0 years |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Aggregate intrinsic value | $ 0 | $ 0 | $ 13,567 | $ 6,265
Options exercised, Aggregate intrinsic value | $ 0 | $ 13,414 | $ 4,921 |
Range of Exercise Prices [Abstract] |  |  |  |
Exercise price range, lower range limit (In dollars per share) | $ 0 | $ 0 | $ 73.06 | $ 73.06
Exercise price range, upper range limit (In dollars per share) | 0 | $ 0 | $ 74.24 | $ 74.24
Total options exercisable, minimum (In dollars per share) | 0 |  |  |
Total options exercisable, maximum (In dollars per share) | $ 0 |  |  |
Total options exercisable (in shares) | 0 |  |  |
Total options exercisable, Weighted average exercise price (In dollars per share) | $ 0.00 |  |  |
Total options exercisable, Weighted average remaining contractual life | 0 years |  |  |
Total options exercisable, Aggregate intrinsic value | $ 0 |  |  |

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