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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017 |  | 2016
Option awards | $ | 23,393 |  |  | $ | 18,423 |  |  | $ | 23,876 |
Other share-based awards | 28,513 |  |  | 28,844 |  |  | 23,368 |
Total share-based compensation before tax | 51,906 |  |  | 47,267 |  |  | 47,244 |
Tax benefit | 12,354 |  |  | 17,555 |  |  | 17,546 |
Total share-based compensation expense included in net income | $ | 39,552 |  |  | $ | 29,712 |  |  | $ | 29,698 |
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, 2018, 2017 and 2016:
| Omnibus Plan (Active) |  | Option Plan (Frozen)
| Shares Outstanding |  | Weighted Average Exercise Price |  | Outstanding Shares |  | Weighted Average Exercise Price
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 |  |  | — |  |  | — |
Granted | 806,698 |  |  | 115.43 |  |  | — |  |  | — |
Exercised | (724,124 | ) |  | 61.49 |  |  | — |  |  | — |
Forfeited | (400,599 | ) |  | 105.70 |  |  | — |  |  | — |
Balance as of December 31, 2018 | 4,575,926 |  |  | $ | 99.53 |  |  | — |  |  | — |
Vested or expected to vest as of December 31, 2018 | 4,575,926 |  |  | $ | 99.53 |  |  | — |  |  | — |
Options exercisable as of December 31, 2018 | 1,909,271 |  |  | $ | 99.47 |  |  | — |  |  | — |
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 $26.50, $18.45 and $16.81 granted during the years ended December 31, 2018, 2017 and 2016, respectively:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Weighted-average volatility | 30 | % |  | 29 | % |  | 32 | %
Expected dividend yield | 2.1 | % |  | 2.6 | % |  | 2.8 | %
Expected term (in years) | 4.4 |  |  | 4.7 |  |  | 4.5 |
Weighted average risk free interest rate | 2.6 | % |  | 1.9 | % |  | 1.4 | %
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, 2018:
| Shares Outstanding |  | Weighted Average Grant Price
Balance as of December 31, 2017 | 1,620,625 |  |  | $ | 93.03 |
Granted | 582,488 |  |  | 114.42 |
Vested | (158,031 | ) |  | 101.95 |
Canceled/Forfeited | (403,885 | ) |  | 123.80 |
Balance as of December 31, 2018 | 1,641,197 |  |  | $ | 92.19 |
Expected to vest as of December 31, 2018 | 1,282,659 |  |  | $ | 98.28 |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -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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