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Stock Incentive Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Performance Shares, Valuation Assumptions | The following are the weighted average-assumptions used to estimate the fair value for all Performance Shares issued in each respective year.
|  | Performance Shares |
| Year ended December 31, | 2014 |  | 2013 |
| Expected volatility (1) | 14.5% - 18.6% |  | 19.0% - 19.6% |
| Expected term (in years) | n/a |  | n/a |
| Expected dividend yield | n/a |  | n/a |
| Risk-free interest rate (1) | 0.08% - 1.65% |  | 0.09% - 1.39% |
(1) | The expected volatility and risk-free interest rate applied are specific to each tranche of Performance Shares.
Schedule of Share-based Compensation, 2001 Stock Incentive Plan, Non-Employee Director Stock Incentive Plan and Premium Option Plan | Premium Option Plan
|  | Weighted options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual life |  | Aggregate intrinsic value |  | Range of exercise prices |
| Balance, December 31, 2011 | 1,192,000 |  |  | $ | 73.94 |  |  |  |  | $ | — |  |  | $73.06 - $74.24 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (350,000 | ) |  | 74.24 |  |  |  |  | 1,250 |  |  |  |
| Balance, December 31, 2012 | 842,000 |  |  | $ | 73.82 |  |  |  |  | $ | 6,265 |  |  | $73.06 - $74.24 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (270,000 | ) |  | 74.24 |  |  |  |  | 4,921 |  |  |  |
| Balance, December 31, 2013 | 572,000 |  |  | $ | 73.62 |  |  |  |  | $ | 13,567 |  |  | $73.06 - $74.24 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (572,000 | ) |  | 73.62 |  |  |  |  | 13,414 |  |  |  |
| Balance, December 31, 2014 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |  |  | $ | — |  |
| Total options exercisable at December 31, 2014 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |  |  | $ | — |  |
2001 Stock Incentive and Non-Employee Director Stock Incentive Plans
|  | Weighted options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual life |  | Aggregate intrinsic value |  | Range of exercise prices |
| Balance, December 31, 2011 | 1,973,307 |  |  | $ | 47.33 |  |  | 4.6 |  | $ | 53,363 |  |  | $37.51 - $59.66 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (240,668 | ) |  | 45.30 |  |  |  |  | $ | 7,910 |  |  |  |
| Balance, December 31, 2012 | 1,732,639 |  |  | $ | 47.61 |  |  | 3.7 |  | $ | 58,305 |  |  | $37.51 - $59.66 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (904,547 | ) |  | 46.55 |  |  |  |  | $ | 36,800 |  |  |  |
| Balance, December 31, 2013 | 828,092 |  |  | $ | 48.77 |  |  | 2.9 |  | $ | 40,221 |  |  | $37.51 - $59.66 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (60,262 | ) |  | $ | 49.52 |  |  |  |  | $ | 2,900 |  |  |  |
| Balance, December 31, 2014 | 767,830 |  |  | $ | 48.71 |  |  | 2.0 |  | $ | 37,246 |  |  | $37.51 - $59.66 |  |
| Total options exercisable at December 31, 2014 | 767,830 |  |  | $ | 48.71 |  |  | 2.0 |  | $ | 37,246 |  |  | $37.51 - $59.66 |  |
Schedule of Share-based Compensation, 2010 Cash Settled Restricted Stock Unit Plan and 2010 Performance-Based Equity Incentive Plan | 2010 Cash Settled Restricted Stock Unit Plan and 2010 Performance-Based Equity Incentive Plan
|  | Cash Settled Restricted Stock Unit Plan |  | Performance Shares (1) |
|  | Number of shares |  | Number of shares |  | Weighted average grant-date fair value |
| Nonvested at December 31, 2011 | 422,973 |  |  | 289,867 |  |  | $ | 30.06 |  |
| Awards granted | 225,105 |  |  | 144,635 |  |  | $ | 28.17 |  |
| Awards vested | (128,401 | ) |  | (70,843 | ) |  |  |
| Awards forfeited | (26,121 | ) |  | (4,139 | ) |  |  |
| Nonvested at December 31, 2012 | 493,556 |  |  | 359,520 |  |  | $ | 29.46 |  |
| Awards granted | 149,760 |  |  | 134,358 |  |  | $ | 33.46 |  |
| Awards vested | (176,265 | ) |  | (24,606 | ) |  |  |
| Awards forfeited | (72,906 | ) |  | (109,729 | ) |  |  |
| Nonvested at December 31, 2013 | 394,145 |  |  | 359,543 |  |  | $ | 30.55 |  |
| Awards granted | 119,382 |  |  | 102,668 |  |  | $ | 46.45 |  |
| Awards vested | (159,094 | ) |  | — |  |  |  |
| Awards forfeited | (16,110 | ) |  | (213,639 | ) |  |  |
| Nonvested at December 31, 2014 | 338,323 |  |  | 248,572 |  |  | $ | 39.62 |  |
(1) For Performance Shares, the number of shares is stated at the maximum number that can be attained if the performance conditions are fully met. Forfeitures represent shares forfeited due to vesting below the maximum attainable as a result of the Company not fully meeting the performance conditions.
Schedule of Share-based Compensation, Restricted Stock | Restricted Stock
|  | Employee restricted stock |  | Non-employee director restricted stock |  | Total restricted stock |
|  | Number of shares |  | Weighted average grant date fair value |  | Number of shares |  | Weighted average grant date fair value |  | Number of shares |  | Weighted average grant date fair value |
| Nonvested at December 31, 2011 | 764,761 |  |  | $ | 53.68 |  |  | 39,585 |  |  | $ | 58.43 |  |  | 804,346 |  |  | $ | 53.91 |  |
| Awards granted | 226,827 |  |  | 72.46 |  |  | 16,874 |  |  | 71.69 |  |  | 243,701 |  |  | 72.40 |  |
| Awards vested | (337,683 | ) |  | 51.06 |  |  | (20,536 | ) |  | 54.62 |  |  | (358,219 | ) |  | 51.26 |  |
| Awards forfeited | (7,157 | ) |  | 53.90 |  |  | — |  |  | — |  |  | (7,157 | ) |  | 53.90 |  |
| Nonvested at December 31, 2012 | 646,748 |  |  | $ | 61.63 |  |  | 35,923 |  |  | $ | 66.83 |  |  | 682,671 |  |  | $ | 61.90 |  |
| Awards granted | 241,071 |  |  | 87.85 |  |  | 17,162 |  |  | 87.40 |  |  | 258,233 |  |  | 87.82 |  |
| Awards vested | (311,334 | ) |  | 55.63 |  |  | (21,599 | ) |  | 66.06 |  |  | (332,933 | ) |  | 56.31 |  |
| Awards forfeited | (6,993 | ) |  | 58.14 |  |  | — |  |  | — |  |  | (6,993 | ) |  | 58.14 |  |
| Nonvested at December 31, 2013 | 569,492 |  |  | $ | 76.11 |  |  | 31,486 |  |  | $ | 78.57 |  |  | 600,978 |  |  | $ | 76.24 |  |
| Awards granted | 215,054 |  |  | 95.79 |  |  | 14,455 |  |  | 95.06 |  |  | 229,509 |  |  | 95.74 |  |
| Awards vested | (332,725 | ) |  | 73.74 |  |  | (15,886 | ) |  | 74.96 |  |  | (348,611 | ) |  | 73.79 |  |
| Awards forfeited | (99 | ) |  | 55.80 |  |  | — |  |  | — |  |  | (99 | ) |  | 55.80 |  |
| Nonvested at December 31, 2014 | 451,722 |  |  | $ | 87.29 |  |  | 30,055 |  |  | $ | 88.41 |  |  | 481,777 |  |  | $ | 87.36 |  |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share, including, but not limited to: (a) expected term of performance shares and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, and (d) risk-free rate(s). + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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