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Employee Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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 EIP, ESP and OIP for the year ended December 31, 2017:
| Number of Class A Shares Subject to Restricted Stock Awards |  | Weighted Average Fair Value |  | Remaining Contractual Life
Nonvested at beginning of year | 1,223,533 |  |  | $ | 17.11 |  |  | 2.1 Years |
Granted | 464,100 |  |  | 17.01 |  |  | 1.9 Years |
Vested | (548,062 | ) |  | 18.59 |  |  | — |
Forfeited | (72,275 | ) |  | 16.50 |  |  | — |
Nonvested at end of year | 1,067,296 |  |  | $ | 16.34 |  |  | 2.2 Years |
Schedule of Stock Option Activity | There were 14,499 and 13,601 options outstanding as of December 31, 2017 and 2016, respectively.
Stock Appreciation Rights | The following table summarized the status of the Company's outstanding OARs awards as of December 31, 2017:
Grant Date |  | Number of OARs Outstanding |  | Strike Price |  | Remaining Contractual Life |  | Fair Value as of December 31, 2017
January 14, 2013 |  | 311,780 |  |  | $ | 15.94 |  |  | 13 Days |  | $ | 10.86 |
January 14, 2014 |  | 391,730 |  |  | 23.48 |  |  | 1 Year |  | 4.75 |
January 9, 2015 |  | 444,660 |  |  | 21.94 |  |  | 2 Years |  | 7.09 |
January 6, 2016 |  | 439,120 |  |  | 15.89 |  |  | 3 Years |  | 11.77 |
January 6, 2017 |  | 421,660 |  |  | 18.90 |  |  | 4 Years |  | 10.35 |
|  | 2,008,950 |  |  |  |  |  |  |
Total weighted average values |  |  |  | $ | 19.35 |  |  | 2.2 Years |  | $ | 8.93 |
Schedule of Assumptions Used | The fair value as of December 31, 2017 for each of the OARs was estimated using the Black-Scholes model with the following assumptions:
|  | Grant Date
|  | January 14, 2013 |  | January 14, 2014 |  | January 9, 2015 |  | January 6, 2016 |  | January 6, 2017
Expected term (1) |  | 13 Days |  |  | 1 Year |  |  | 2 Years |  |  | 3 Years |  |  | 4 Years |
Expected volatility factor (2) |  | 20.683 | % |  | 27.995 | % |  | 32.249 | % |  | 35.174 | % |  | 34.439 | %
Risk-free interest rate (3) |  | 0.613 | % |  | 1.738 | % |  | 1.887 | % |  | 1.971 | % |  | 2.089 | %
Actual dividends (4) |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |
(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, 2017.
(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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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&loc=d3e5070-113901 + Details
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