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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017.

 
Three Months Ended September 30, 2018
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
35.0

 
$
20.29

Granted
—

 
—

Vested
(8.5
)
 
17.11

Forfeited
—

 
—

Outstanding (unvested) at end of period
26.5

 
$
21.31

 
Nine Months Ended September 30, 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
5.0

 
19.03

Vested
(30.7
)
 
22.03

Forfeited
(1.5
)
 
17.11

Outstanding (unvested) at end of period
26.5

 
$
21.31

 
Three Months Ended September 30, 2017
 
Number of Shares of Restricted Stock Awards (in thousands)
 
Weighted Average Grant Date Fair Value
Unvested at beginning of period
40.5

 
$
19.69

Granted
—

 
—

Vested
(9.7
)
 
17.11

Forfeited
—

 
—

Outstanding (unvested) at end of period
30.8

 
$
20.51


 
Nine Months Ended September 30, 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
3.0

 
20.53

Vested
(25.2
)
 
22.07

Forfeited
—

 
—

Outstanding (unvested) at end of period
30.8

 
$
20.51