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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Stock-Based Compensation [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table summarizes our restricted stock award activity for the years ended December 31, 2015, 2014 and 2013. The vesting date for the majority of awards vested in 2015 was June 1, 2015. The fair value of awards vested during 2015, 2014 and 2013 was $1.6 million, $1.1 million and $1.1 million, respectively.
 
2015
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of year
183.1

 
$
16.78

Granted
17.9

 
20.92

Vested
(98.6
)
 
16.49

Forfeited
—

 
—

Outstanding (unvested) at end of year
102.4

 
$
18.36


 
2014
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of year
211.5

 
$
13.81

Granted
52.2

 
25.40

Vested
(75.6
)
 
14.34

Forfeited
(5.0
)
 
13.57

Outstanding (unvested) at end of year
183.1

 
$
16.78


 
2013
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of year
276.8

 
$
13.57

Granted
23.0

 
17.28

Vested
(75.3
)
 
14.04

Forfeited
(13.0
)
 
13.57

Outstanding (unvested) at end of year
211.5

 
$
13.81