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Benefit Plans (Tables)
 12 Months Ended
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