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Stockholders' Equity and Equity Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Summary of all stock award activity
The following table summarizes all stock award activity during the nine months ended September 30, 2015:
 
Stock Awards
 
Weighted
Average
Award Date
Fair Value
Outstanding at January 1, 2015
767,540

 
$
21.93

Restricted shares awarded
—

 
—

Restricted stock units awarded
700,171

 
17.26

Restricted shares distributed
(88,901
)
 
19.16

Restricted stock units distributed
(12,326
)
 
19.56

Restricted shares forfeited
(50,552
)
 
23.41

Restricted stock units forfeited
(42,630
)
 
19.59

Outstanding at September 30, 2015
1,273,302

 
$
19.60
Summary of all deferred stock unit activity
The following table summarizes all deferred stock unit activity during the nine months ended September 30, 2015:

Deferred
Stock
Units

Weighted
Average
Award Date
Fair Value
Outstanding at January 1, 2015
221,471

 
$
20.10

Awarded
52,287

 
18.61

Distributed
(27,779
)
 
18.76

Outstanding at September 30, 2015
245,979

 
$
19.93
Summary of stock option activity
The following table summarizes all stock option activity during the nine months ended September 30, 2015:

Shares

Weighted
Average
Exercise
Price
Outstanding at January 1, 2015
503,134

 
$
18.18

Granted
—

 
—

Exercised
(109,344
)
 
13.40

Canceled/Expired
(5,546
)
 
24.21

Outstanding at September 30, 2015
388,244

 
$
19.45

Exercisable at September 30, 2015
384,790

 
$
19.46
Financial data for stock option exercises
Financial data for stock option exercises are summarized in the following table (in thousands):

Nine Months Ended September 30,

2015
 
2014
Amount collected from stock option exercises
$
1,465

 
$
8,614

Total intrinsic value of stock option exercises
282

 
3,771

Tax shortfall of stock option exercises recorded in additional paid-in-capital
109

 
6

Aggregate intrinsic value of outstanding stock options
379

 
2,381

Aggregate intrinsic value of exercisable stock options
379

 
2,138
Summary of valuation assumptions
The fair value of stock options awarded during the nine-month period ended September 30, 2014 was estimated at the date of grant based on the assumptions presented in the table below:
 
Nine Months Ended
September 30, 2014
Grant-date fair value
$11.27
Volatility
41.6%
Expected term (years)
7.0
Dividend yield
—%
Risk-free rate
2.3%