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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017.

 
Three Months Ended March 31, 2018
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
53.7

 
$
21.82

Granted
—

 
—

Vested
(13.5
)
 
24.86

Forfeited
—

 
—

Outstanding (unvested) at end of period
40.2

 
$
20.79


 
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