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Employee Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015:
| Number of Class A Shares Subject to Restricted Stock Awards |  | Weighted Average Fair Value |  | Remaining Contractual Life
Nonvested at beginning of year | 1,239,346 |  |  | $ | 20.12 |  |  | 1.7 Years |
Granted | 399,566 |  |  | 19.05 |  |  | 3.4 Years |
Vested | (210,516 | ) |  | 24.59 |  |  | — |
Forfeited | (170,838 | ) |  | 18.27 |  |  | — |
Nonvested at end of year | 1,257,558 |  |  | $ | 19.29 |  |  | 1.7 Years |
Schedule of Fair Value of Awarded Stock Option Estimated on Grant Date Using Black-Scholes Model | The fair value of each award of stock options was estimated on the grant date using the Black-Scholes model with the following assumptions:
|  |  | Grant Date Assumptions
| 2015 |  | 2014 |  | 2013 |  | 2012 |  | 2011
Expected term (1) | 5 years |  | 5 years |  | 5 years |  | 5 years |  | 5 years
Expected volatility factor (2) | 55.43 | % |  | 56.31 | % |  | 53.82 | % |  | 54.95 | % |  | 52.52 | %
Risk-free interest rate (3) | 1.27 | % |  | 1.49 | % |  | 0.84 | % |  | 0.70 | % |  | 2.00 | %
Actual dividends (4) | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |  |  | $ | 0.44 |
(1) | The expected term was determined based on 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 the time of grant.
(4) | Actual dividends were used to compute the expected annual dividend yield.
Schedule of Stock Option Activity | Stock option activity under the OIP and EIP since January 1, 2014 is summarized as follows:
| Year Ended December 31,
| 2015 |  | 2014
| Number of Options |  | Weighted Average Exercise Price |  | Number of Options |  | Weighted Average Exercise Price
Options outstanding at beginning of year | 45,549 |  |  | $ | 25.50 |  |  | 72,573 |  |  | $ | 24.46 |
Options granted | 4,177 |  |  | 19.76 |  |  | 2,976 |  |  | 23.49 |
Options exercised | — |  |  | — |  |  | (15,000 | ) |  | 12.33 |
Options forfeited or expired | (37,699 | ) |  | 26.12 |  |  | (15,000 | ) |  | 33.22 |
Options outstanding at end of year | 12,027 |  |  | $ | 21.57 |  |  | 45,549 |  |  | $ | 25.50 |
Options vested at end of year | 3,366 |  |  | $ | 23.56 |  |  | 30,513 |  |  | $ | 25.99 |
Weighted average fair value of options granted during the year | $ | 7.87 |  |  |  |  | $ | 9.94 |  |  |
Summarizes Stock Options Outstanding and Exercisable | The following table summarizes stock options outstanding and exercisable as of December 31, 2015:
Range of Exercise Prices | Number of Options Outstanding |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price of Outstanding Options |  | Number of Options Exercisable (Vested) |  | Weighted Average Exercise Price of Vested Options
$17.20 - $20.00 | 6,718 |  |  | 3.08 Years |  | $ | 19.29 |  |  | 1,033 |  |  | $ | 18.82 |
$20.01 - $25.66 | 5,309 |  |  | 1.76 Years |  | 24.44 |  |  | 2,333 |  |  | 25.66 |
$17.20 - $25.66 | 12,027 |  |  | 2.50 Years |  | $ | 21.57 |  |  | 3,366 |  |  | $ | 23.56 |
Summarizes of Company's Non-Vested Options | The following table summarizes the status of the Company's non-vested options for the year ended December 31, 2015:
| Number of Options |  | Weighted Average Fair Value
Nonvested at beginning of year | 15,036 |  |  | $ | 10.17 |
Granted | 4,177 |  |  | 7.87 |
Vested | (10,552 | ) |  | 10.66 |
Nonvested at end of year | 8,661 |  |  | $ | 8.46 |
Stock Appreciation Rights | The following table summarized the status of the Company's outstanding OARs awards as of December 31, 2015:
Grant Date | Number of OARs Outstanding |  | Strike Price |  | Remaining Contractual Life |  | Fair Value at December 31, 2015
January 13, 2011 | 289,320 |  |  | $ | 26.35 |  |  | 12 Days |  | $ | — |
January 19, 2012 | 324,710 |  |  | 18.94 |  |  | 1 Year |  | 1.52 |
January 14, 2013 | 347,130 |  |  | 15.94 |  |  | 2 Years |  | 3.45 |
January 14, 2014 | 442,790 |  |  | 23.48 |  |  | 3 Years |  | 1.78 |
January 9, 2015 | 503,080 |  |  | 21.94 |  |  | 4 Years |  | 2.74 |
| 1,907,030 |  |  |  |  |  |  |
Total weighted average values |  |  | $ | 21.36 |  |  | 2.3 Years |  | $ | 2.02 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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