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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Employee Benefits and Share-based Compensation, Noncash [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, 2014 and 2015 | 1,350,410 |  |  | $ | 7.05 |
Exercised | (944,169 | ) |  | 7.17 |
Balance at December 31, 2016 | 406,241 |  |  | 6.78 |
Exercised | (271,451 | ) |  | 6.48 |
Balance at December 31, 2017 | 134,790 |  |  | $ | 7.39 |
Schedule of Nonvested Share Activity | Non-vested share activity for the years ended December 31, 2017 and 2016, is as follows:
| Number of Shares |  | Weighted-Average Value Per Share
Balance at December 31, 2015 | 2,369,350 |  |  | $ | 9.55 |
Granted | 1,034,019 |  |  | 5.23 |
Vested | (252,059 | ) |  | 10.13 |
Balance at December 31, 2016 | 3,151,310 |  |  | 8.09 |
Granted | 777,900 |  |  | 6.83 |
Vested | (161,912 | ) |  | 8.90 |
Balance at December 31, 2017 | 3,767,298 |  |  | $ | 7.79 |
Schedule of Share-based Compensation, Activity | During 2017 and 2016, the Company granted common shares to certain employees and trustees as follows:
| 2017 |  | 2016
Performance Shares(1) |  |  |
Shares issued: |  |  |
Index - 1Q | 106,706 |  | 404,466
Peer - 1Q | 106,705 |  | 404,463
Index - 2Q | 163,466 |  | —
Peer - 2Q | 163,463 |  | —
Grant date fair value per share:(2) |  |  |
Index - 1Q | $6.82 |  | $4.53
Peer - 1Q | $6.34 |  | $4.58
Index - 2Q | $4.05 |  | $—
Peer - 2Q | $4.27 |  | $—
Non-Vested Common Shares:(3) |  |  |
Shares issued | 237,560 |  | 225,090
Grant date fair value | $2,551 |  | $1,724
(1) | The shares vest based on the Company's total shareholder return growth after a three-year measurement period relative to an index and a group of Company peers. Dividends will not be paid on these grants until earned. Once the performance criteria are met and the actual number of shares earned is determined, such shares vest immediately. The 2Q shares were subject to shareholder approval, which was obtained in May 2017.
(2) | The fair value of grants was determined at the grant date using a Monte Carlo simulation model.
(3) | The shares vest ratably over a three-year service period

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- Definition Tabular disclosure for share-based compensation 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 (c)(2) -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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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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- 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=96867065&loc=d3e5070-113901 + Details
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