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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
Stock-Based Compensation [Abstract]  
Disclosure of restricted stock award activity
The following tables summarizes our restricted stock award activity for the three and six months ended June 30, 2015 and 2014.
 
Three Months Ended June 30, 2015
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
175.1

 
$
16.49

Granted
2.2

 
21.19

Vested
(70.5
)
 
—

Forfeited
(2.2
)
 
—

Outstanding (unvested) at end of period
104.6

 
$
18.04


 
Six Months Ended June 30, 2015
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
183.1

 
$
16.78

Granted
4.2

 
24.06

Vested
(80.5
)
 
—

Forfeited
(2.2
)
 
—

Outstanding (unvested) at end of period
104.6

 
$
18.04



 
Three and Six Months Ended June 30, 2014
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
211.6

 
$
13.81

Granted
8.5

 
22.01

Vested
(72.7
)
 
—

Forfeited
—

 
—

Outstanding (unvested) at end of period
147.4

 
$
14.16