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Employee Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summarizes of Company's Non-Vested ESP/EIP Awards | The following table summarizes the status of the Company's non-vested restricted Class A Stock awards under the OIP for the year ended December 31, 2019:
| Number of Class A Shares Subject to Restricted Stock Awards |  | Weighted Average Fair Value |  | Remaining Contractual Life
Nonvested at beginning of year | 1,289,224 |  |  | $ | 18.72 |  |  | 1.8 Years |
Granted | 379,728 |  |  | 25.32 |  |  | 3.1 Years |
Vested | (112,465 | ) |  | 17.92 |  |  | — |
Forfeited | (22,209 | ) |  | 23.75 |  |  | — |
Nonvested at end of year | 1,534,278 |  |  | $ | 20.34 |  |  | 1.4 Years |
Schedule of Stock Option Activity | There were 14,974 and 15,573 options outstanding as of December 31, 2019 and 2018, respectively.
Stock Appreciation Rights | The following table summarizes the status of the Company's outstanding OARs awards as of December 31, 2019:
Grant Date |  | Number of OARs Outstanding |  | Strike Price |  | Remaining Contractual Life |  | Fair Value as of December 31, 2019
January 9, 2015 |  | 405,950 |  |  | $ | 21.94 |  |  | 8 Days |  | $ | 5.54 |
January 6, 2016 |  | 404,040 |  |  | 15.89 |  |  | 1 Year |  | 11.40 |
January 6, 2017 |  | 387,980 |  |  | 18.90 |  |  | 2 Years |  | 8.81 |
January 5, 2018 |  | 458,010 |  |  | 27.05 |  |  | 3 Years |  | 4.72 |
January 11, 2019 |  | 535,366 |  |  | 26.45 |  |  | 4 Years |  | 6.17 |
Total OARs Outstanding |  | 2,191,346 |  |  |  |  |  |  |
Total weighted average values |  |  |  | $ | 22.46 |  |  | 2.9 Years |  | $ | 7.18 |
Schedule of Assumptions Used | The fair value as of December 31, 2019 for each of the OARs was estimated using the Black-Scholes model with the following assumptions:
|  | Grant Date
|  | January 9, 2015 |  | January 6, 2016 |  | January 6, 2017 |  | January 5, 2018 |  | January 11, 2019
Expected term (1) |  | 8 Days |  |  | 1 Year |  |  | 2 Years |  |  | 3 Years |  |  | 4 Years |
Expected volatility factor (2) |  | 6.6 | % |  | 26.0 | % |  | 24.9 | % |  | 25.7 | % |  | 28.7 | %
Risk-free interest rate (3) |  | 0.7 | % |  | 1.6 | % |  | 1.6 | % |  | 1.6 | % |  | 1.7 | %
Actual dividends (4) |  | $ | 0.46 |  |  | $ | 0.46 |  |  | $ | 0.46 |  |  | $ | 0.46 |  |  | $ | 0.46 |
(1) The expected term was determined based on the remaining life of the actual awards. (2) The volatility factor was measured using the weighted average of historical daily price changes of the Company's Class A Stock over a historical period commensurate to the expected term of the awards. (3) The risk-free interest rate was based on periods equal to the expected term of the awards based on the U.S. Treasury yield curve in effect at December 31, 2019. (4) Actual dividends were used to compute the expected annual dividend yield.

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- Definition Tabular disclosure of the fair value of each stock appreciation rights award estimated using Black-Scholes option pricing model. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average fair value and remaining contractual term for non-vested equity-based payment instruments, excluding stock (or unit) options that were outstanding at the beginning and end of the year, and the number of awards that were granted, vested, forfeited, and expired during the year. + References No definition available. + Details
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