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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2017
Stock-Based Compensation [Abstract]  
Disclosure of restricted stock award activity
The following tables summarize our restricted stock award activity for the three months ended March 31, 2017 and 2016.
 
Three Months Ended March 31, 2017
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
53.0

 
$
21.53

Granted
—

 
—

Vested
(8.5
)
 
26.12

Forfeited
—

 
—

Outstanding (unvested) at end of period
44.5

 
$
20.33



 
Three Months Ended March 31, 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
—

 
17.48

Vested
(46.4
)
 
18.51

Forfeited
—

 
—

Outstanding (unvested) at end of period
89.0

 
$
17.68