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Stock Incentive Compensation and Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
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 share awards issued in each respective year.
|  | Performance Share Awards |
| Year ended December 31, | 2018 |  | 2017 |
| Expected volatility (1) | 15.8% |  | 14.3% |
| Expected term (in years) | n/a |  | n/a |
| Expected dividend yield | n/a |  | n/a |
| Risk-free interest rate (1) | 1.85% - 2.36% |  | 0.93% - 1.69% |
(1) | The expected volatility and risk-free interest rate applied are specific to each tranche of performance share awards.
Schedule of Share-based Compensation, Options and Premium Option Plan Awards | The following is a summary of activity under the Company’s stock compensation plans. Stock Options
|  | Weighted options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual life |  | Aggregate intrinsic value |  | Range of exercise prices |
| Balance, December 31, 2015 | 408,212 |  |  | $ | 51.90 |  |  | 1.6 |  | $ | 25,020 |  |  | $42.66 - $59.66 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (201,417 | ) |  | 50.59 |  |  |  |  | $ | 14,806 |  |  | — |  |
| Balance, December 31, 2016 | 206,795 |  |  | $ | 53.17 |  |  | 0.9 |  | $ | 17,174 |  |  | $50.71 - $59.66 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (174,794 | ) |  | 53.04 |  |  |  |  | $ | 15,945 |  |  | — |  |
| Balance, December 31, 2017 | 32,001 |  |  | $ | 53.86 |  |  | 0.2 |  | $ | 2,295 |  |  | 53.86 |  |
| Options granted | — |  |  | — |  |  |  |  |  |  | — |  |
| Options forfeited | — |  |  | — |  |  |  |  |  |  |  |
| Options expired | — |  |  | — |  |  |  |  |  |  |  |
| Options exercised | (32,001 | ) |  | $ | 53.86 |  |  |  |  | $ | 2,320 |  |  | $ | — |  |
| Balance, December 31, 2018 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |  |  | $ | — |  |
| Total options exercisable at December 31, 2018 | — |  |  | $ | — |  |  | 0.0 |  | $ | — |  |  | $ | — |  |
Schedule of Share-based Compensation, Cash Settled Restricted Stock Units and Performance Shares | Cash Settled Restricted Stock Units
|  | Number of shares |
| Nonvested at December 31, 2015 | 326,078 |  |
| Awards granted | 135,119 |  |
| Awards vested | (133,278 | ) |
| Awards forfeited | (19,575 | ) |
| Nonvested at December 31, 2016 | 308,344 |  |
| Awards granted | 98,067 |  |
| Awards vested | (122,088 | ) |
| Awards forfeited | (21,993 | ) |
| Nonvested at December 31, 2017 | 262,330 |  |
| Awards granted | — |  |
| Awards vested | (108,344 | ) |
| Awards forfeited | (7,069 | ) |
| Nonvested at December 31, 2018 | 146,917 |  |
Performance Share Awards
|  | Number of shares (1) |  | Weighted average grant-date fair value |
| Nonvested at December 31, 2015 | 230,271 |  |  | $ | 41.40 |  |
| Awards granted | 77,045 |  |  | $ | 48.31 |  |
| Awards vested | (58,032 | ) |  | $ | 38.30 |  |
| Awards forfeited | (37,903 | ) |  |  |
| Nonvested at December 31, 2016 | 211,381 |  |  | $ | 44.63 |  |
| Awards granted | 64,947 |  |  | $ | 65.27 |  |
| Awards vested | (62,499 | ) |  | $ | 43.51 |  |
| Awards forfeited | (46,156 | ) |  |  |
| Nonvested at December 31, 2017 | 167,673 |  |  | $ | 53.11 |  |
| Awards granted | 83,475 |  |  | $ | 60.69 |  |
| Awards vested | (16,456 | ) |  | $ | 53.79 |  |
| Awards forfeited | (82,241 | ) |  |  |
| Nonvested at December 31, 2018 | 152,451 |  |  | $ | 57.21 |  |
(1) | For performance share awards, 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 Awards | Restricted Stock Awards
|  | Employee restricted stock awards |  | Non-employee director restricted stock awards |  | Total restricted stock awards |
|  | 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, 2015 | 479,040 |  |  | $ | 94.95 |  |  | 26,886 |  |  | $ | 97.61 |  |  | 505,926 |  |  | $ | 95.09 |  |
| Awards granted | 179,003 |  |  | 112.41 |  |  | 14,727 |  |  | 114.71 |  |  | 193,730 |  |  | 112.59 |  |
| Awards vested | (255,873 | ) |  | 93.98 |  |  | (16,068 | ) |  | 96.83 |  |  | (271,941 | ) |  | 94.15 |  |
| Awards forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Nonvested at December 31, 2016 | 402,170 |  |  | $ | 103.34 |  |  | 25,545 |  |  | $ | 107.95 |  |  | 427,715 |  |  | $ | 103.61 |  |
| Awards granted | 116,345 |  |  | 148.66 |  |  | 12,193 |  |  | 150.05 |  |  | 128,538 |  |  | 148.79 |  |
| Awards vested | (185,478 | ) |  | 100.17 |  |  | (17,612 | ) |  | 110.66 |  |  | (203,090 | ) |  | 101.08 |  |
| Awards forfeited | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Nonvested at December 31, 2017 | 333,037 |  |  | $ | 120.93 |  |  | 20,126 |  |  | $ | 131.09 |  |  | 353,163 |  |  | $ | 121.51 |  |
| Awards granted | 255,799 |  |  | 132.70 |  |  | 12,169 |  |  | 127.29 |  |  | 267,968 |  |  | 132.79 |  |
| Awards vested | (139,454 | ) |  | 112.70 |  |  | (9,761 | ) |  | 123.59 |  |  | (149,215 | ) |  | 113.41 |  |
| Awards forfeited | (1,642 | ) |  | 134.38 |  |  | — |  |  | — |  |  | (1,642 | ) |  | 134.38 |  |
| Nonvested at December 31, 2018 | 447,740 |  |  | $ | 130.37 |  |  | 22,534 |  |  | $ | 132.29 |  |  | 470,274 |  |  | $ | 130.46 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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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