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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2016
406,241

 
$
6.78

Exercised
(271,451
)
 
6.48

Balance at December 31, 2017
134,790

 
7.39

Exercised
(16,390
)
 
6.99

Balance at December 31, 2018
118,400

 
$
7.44
Schedule of Nonvested Share Activity
Non-vested share activity for the years ended December 31, 2018 and 2017, is as follows:
 
Number of
Shares
 
Weighted-Average Grant-Date Fair
Value Per Share
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

Granted
899,614

 
6.55

Vested
(618,383
)
 
9.70

Forfeited
(593,452
)
 
6.59

Balance at December 31, 2018
3,455,077

 
$
7.34
Schedule of Share-based Compensation, Activity
During 2018 and 2017, the Company granted common shares to certain employees and trustees as follows:
 
2018
 
2017
Performance Shares(1)
 
 
 
Shares issued:
 
 
 
Index - 1Q
331,025
 
106,706
Peer - 1Q
331,019
 
106,705
Index - 2Q

 
163,466
Peer - 2Q

 
163,463
 
 
 
 
Grant date fair value per share:(2)
 
 
 
Index - 1Q
$5.81
 
$6.82
Peer - 1Q
$5.37
 
$6.34
Index - 2Q
 
 
$4.05
Peer - 2Q
 
 
$4.27
 
 
 
 
Non-Vested Common Shares:(3)
 
 
 
Shares issued
237,570
 
237,560
Grant date fair value
$2,190
 
$2,551
(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. During 2018, 116,926 of the 642,029 performance shares issued in 2015 vested.
(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