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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Weighted options outstanding: |  |  |  |  |
Beginning balance (in shares) | 206,795 | 408,212 | 767,830 |  |
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) | (174,794) | (201,417) | (359,618) |  |
Ending balance (in shares) | 32,001 | 206,795 | 408,212 | 767,830 |
Weighted average exercise price: |  |  |  |  |
Weighted average exercise price, beginning balance (in usd per share) | $ 53.17 | $ 51.90 | $ 48.71 |  |
Options granted, Weighted average exercise price (in usd per share) | 0.00 | 0.00 | 0.00 |  |
Options forfeited, Weighted average exercise price (in usd per share) | 0.00 | 0.00 | 0.00 |  |
Options expired, Weighted average exercise price (in usd per share) | 0.00 | 0.00 | 0.00 |  |
Options exercised, Weighted average exercise price (in usd per share) | 53.04 | 50.59 | 45.09 |  |
Weighted average exercise price, ending balance (in usd per share) | $ 53.86 | $ 53.17 | $ 51.90 | $ 48.71 |
Weighted average remaining contractual life | 2 months 12 days | 10 months 24 days | 1 year 7 months 6 days |  | 2 years
Aggregate Intrinsic Value [Abstract] |  |  |  |  |
Aggregate intrinsic value | $ 2,295 | $ 17,174 | $ 25,020 | $ 37,246 |
Options exercised, Aggregate intrinsic value | $ 15,945 | $ 14,806 | $ 21,205 |  |
Range of Exercise Prices [Abstract] |  |  |  |  |
Exercise price range, lower range limit (in usd per share) |  | $ 50.71 | $ 42.66 | $ 37.51 |
Exercise price range, upper range limit (in usd per share) |  | $ 59.66 | $ 59.66 | $ 59.66 |
Total options outstanding (in usd per share) | $ 53.86 |  |  |  |
Total options exercisable (in usd per share) | $ 53.86 |  |  |  |
Total options exercisable (in shares) | 32,001 |  |  |  |
Total options exercisable, Weighted average exercise price (in usd per share) | $ 53.86 |  |  |  |
Total options exercisable, Weighted average remaining contractual life | 2 months 12 days |  |  |  |
Total options exercisable, Aggregate intrinsic value | $ 2,295 |  |  |  |

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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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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