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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Stock-Based Compensation [Abstract]  
Disclosure of restricted stock award activity
The following tables summarize our restricted stock award activity for the three and nine months ended September 30, 2016 and 2015.
 
Three Months Ended September 30, 2016
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
66.8

 
$
20.55

Granted
—

 
—

Vested
(11.8
)
 
17.11

Forfeited
—

 
—

Outstanding (unvested) at end of period
55.1

 
$
21.29


 
Nine Months Ended September 30, 2016
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
102.4

 
$
18.36

Granted
74.0

 
17.27

Vested
(121.4
)
 
17.05

Forfeited
—

 
—

Outstanding (unvested) at end of period
55.1

 
$
21.29


 
Three Months Ended September 30, 2015
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
104.6

 
$
18.04

Granted
11.2

 
19.94

Vested
(13.2
)
 
18.97

Forfeited
—

 
—

Outstanding (unvested) at end of period
102.6

 
$
18.13


 
Nine Months Ended September 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
15.4

 
21.07

Vested
(95.9
)
 
16.25

Forfeited
—

 
—

Outstanding (unvested) at end of period
102.6

 
$
18.13