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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016 and 2015. The vesting dates for the awards vested in 2017 occurred relatively evenly throughout the first half of the year ended December 31, 2017. The fair value of awards vested during 2017, 2016 and 2015 was $0.6 million, $2.0 million and $1.6 million, respectively.
 
2017
 
Number of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of year
53.0

 
$
21.53

Granted
27.0

 
22.98

Vested
(25.3
)
 
22.07

Forfeited
(1.0
)
 
17.11

Outstanding (unvested) at end of year
53.7

 
$
21.82


 
2016
 
Number of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of year
102.4

 
$
18.36

Granted
74.0

 
17.27

Vested
(122.2
)
 
16.21

Forfeited
(1.2
)
 
22.21

Outstanding (unvested) at end of year
53.0

 
$
21.53


 
2015
 
Number 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