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Stock Incentive Compensation and Employee Benefit Plans (Schedule of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted options outstanding: |  |  |  |  |
Balance, Beginning of Period (shares) | 767,830 | 408,212 | 767,830 | 828,092 |
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) |  | (201,417) | (359,618) | (60,262) |
Balance, End of Period (shares) |  | 206,795 | 408,212 | 767,830 | 828,092
Weighted average exercise price: |  |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 48.71 | $ 51.90 | $ 48.71 | $ 48.77 |
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) |  | 50.59 | 45.09 | 49.52 |
Weighted average exercise price, End of Period (In dollars per share) |  | $ 53.17 | $ 51.90 | $ 48.71 | $ 48.77
Weighted average remaining contractual life |  | 10 months 24 days | 1 year 7 months 6 days | 2 years | 2 years 10 months 24 days
Aggregate Intrinsic Value [Abstract] |  |  |  |  |
Aggregate intrinsic value |  | $ 17,174 | $ 25,020 | $ 37,246 | $ 40,221
Options exercised, Aggregate intrinsic value |  | $ 14,806 | $ 21,205 | $ 2,900 |
Range of Exercise Prices [Abstract] |  |  |  |  |
Exercise price range, lower range limit (In dollars per share) |  | $ 50.71 | $ 42.66 | $ 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) |  | 50.71 |  |  |
Total options exercisable, maximum (In dollars per share) |  | $ 59.66 |  |  |
Total options exercisable (in shares) |  | 206,795 |  |  |
Total options exercisable, Weighted average exercise price (In dollars per share) |  | $ 53.17 |  |  |
Total options exercisable, Weighted average remaining contractual life |  | 10 months 24 days |  |  |
Total options exercisable, Aggregate intrinsic value |  | $ 17,174 |  |  |
Premium Option Plan Awards |  |  |  |  |
Weighted options outstanding: |  |  |  |  |
Balance, Beginning of Period (shares) | 0 | 0 | 0 | 572,000 |
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 | 0 | (572,000) |
Balance, End of Period (shares) |  | 0 | 0 | 0 | 572,000
Weighted average exercise price: |  |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 73.62 |
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 | 0.00 | 73.62 |
Weighted average exercise price, End of Period (In dollars per share) |  | $ 0.00 | $ 0.00 | $ 0.00 | $ 73.62
Weighted average remaining contractual life |  | 0 years |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |  |
Aggregate intrinsic value |  | $ 0 | $ 0 | $ 0 | $ 13,567
Options exercised, Aggregate intrinsic value |  | $ 0 | $ 0 | $ 13,414 |
Range of Exercise Prices [Abstract] |  |  |  |  |
Exercise price range, lower range limit (In dollars per share) |  | $ 0 | $ 0 | $ 0 | $ 73.06
Exercise price range, upper range limit (In dollars per share) |  | 0 | $ 0 | $ 0 | $ 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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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