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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of share-based compensation expenses | Total share-based compensation expenses were as follows (in thousands):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Option plan | $ | 18,423 |  |  | $ | 23,876 |  |  | $ | 26,191 |
Other share-based awards | 28,844 |  |  | 23,368 |  |  | 23,275 |
Total share-based compensation before tax | 47,267 |  |  | 47,244 |  |  | 49,466 |
Tax benefit | 17,555 |  |  | 17,546 |  |  | 18,451 |
Total share-based compensation expense included in net income | $ | 29,712 |  |  | $ | 29,698 |  |  | $ | 31,015 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following summarizes stock option activity and the weighted average exercise price for the following plans for the each of the three years ended December 31, 2017, 2016 and 2015:
| Omnibus Plan (Active) |  | Option Plan (Frozen)
| Outstanding Shares |  | Weighted Average Exercise Price |  | Outstanding Shares |  | Weighted Average Exercise Price
Balance as of December 31, 2014 | 4,206,512 |  |  | $ | 66.38 |  |  | 63,233 |  |  | $ | 23.76 |
Granted | 743,062 |  |  | 150.81 |  |  | — |  |  | — |
Exercised | (706,750 | ) |  | 40.21 |  |  | (44,283 | ) |  | 23.92 |
Forfeited | (137,285 | ) |  | 112.95 |  |  | — |  |  | — |
Balance as of December 31, 2015 | 4,105,539 |  |  | $ | 84.61 |  |  | 18,950 |  |  | $ | 23.37 |
Granted | 1,326,430 |  |  | 78.72 |  |  | — |  |  | — |
Exercised | (348,206 | ) |  | 40.51 |  |  | (18,950 | ) |  | 23.37 |
Forfeited | (366,702 | ) |  | 108.90 |  |  | — |  |  | — |
Balance as of December 31, 2016 | 4,717,061 |  |  | $ | 84.32 |  |  | — |  |  | — |
Granted | 1,267,812 |  |  | 88.22 |  |  | — |  |  | — |
Exercised | (898,417 | ) |  | 44.18 |  |  | — |  |  | — |
Forfeited | (192,505 | ) |  | 108.15 |  |  | — |  |  | — |
Balance as of December 31, 2017 | 4,893,951 |  |  | $ | 91.78 |  |  | — |  |  | — |
Vested or expected to vest as of December 31, 2017 | 4,893,951 |  |  | $ | 91.78 |  |  | — |  |  | — |
Options exercisable as of December 31, 2017 | 1,921,189 |  |  | $ | 88.21 |  |  | — |  |  | — |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following assumptions were used to estimate the weighted average fair value of options of $18.45, $16.81 and $37.64 granted during the years ended December 31, 2017, 2016 and 2015, respectively:
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Weighted-average volatility | 29 | % |  | 32 | % |  | 32 | %
Expected dividend yield | 2.6 | % |  | 2.8 | % |  | 1.4 | %
Expected term (in years) | 4.7 |  |  | 4.5 |  |  | 4.5 |
Weighted average risk free interest rate | 1.9 | % |  | 1.4 | % |  | 1.5 | %
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] | The following table summarizes restricted stock activity for the year ended December 31, 2017:
| Shares Outstanding |  | Weighted Average Grant Price
Balance as of December 31, 2016 | 1,521,202 |  |  | $ | 103.05 |
Granted | 526,119 |  |  | 85.97 |
Vested | (84,663 | ) |  | 134.23 |
Canceled/Forfeited | (342,033 | ) |  | 116.55 |
Balance as of December 31, 2017 | 1,620,625 |  |  | $ | 93.03 |
Expected to vest as of December 31, 2017 | 1,176,085 |  |  | $ | 87.92 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(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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