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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016.
 
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


 
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
55.0

 
$
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
55.0

 
$
21.29