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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Employee Benefits and Share-based Compensation [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The more significant assumptions underlying the determination of fair value for options granted were as follows:
|  | 2010 Options |  | 2009 Options |  | 2008 Options
Weighted-average fair value of options granted |  | $ | 1.94 |  |  | $ | 2.19 |  |  | $ | 1.24 |
Weighted-average risk-free interest rate |  | 2.54 | % |  | 3.29 | % |  | 1.33 | %
Weighted-average expected option lives (in years) |  | 6.50 |  |  | 6.70 |  |  | 3.60 |
Weighted-average expected volatility |  | 49.00 | % |  | 59.08 | % |  | 59.94 | %
Weighted-average expected dividend yield |  | 7.40 | % |  | 6.26 | % |  | 14.40 | %
Schedule of Share-based Compensation, Stock Options, Activity | Share option activity during the years indicated is as follows:
| Number of Shares |  | Weighted-Average Exercise Price Per Share
Balance at December 31, 2012 | 3,480,080 |  |  | $ | 6.44 |
Exercised | (1,519,179 | ) |  | 5.77 |
Forfeited | (5,200 | ) |  | 7.47 |
Balance at December 31, 2013 | 1,955,701 |  |  | 6.95 |
Exercised | (594,791 | ) |  | 6.71 |
Forfeited | (10,500 | ) |  | 7.46 |
Balance at December 31, 2014 and 2015 | 1,350,410 |  |  | $ | 7.05 |
Schedule of Nonvested Share Activity | Non-vested share activity for the years ended December 31, 2015 and 2014, is as follows:
| Number of Shares |  | Weighted-Average Value Per Share
Balance at December 31, 2013 | 2,521,046 |  |  | $ | 10.46 |
Vested | (537,003 | ) |  | 9.16 |
Forfeited | (13,658 | ) |  | 9.96 |
Balance at December 31, 2014 | 1,970,385 |  |  | 10.82 |
Granted | 812,679 |  |  | 7.70 |
Vested | (413,714 | ) |  | 11.95 |
Balance at December 31, 2015 | 2,369,350 |  |  | $ | 9.55 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(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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