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Stock Options (Tables)
6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Fair Value Assumptions on Stock Options
For the six months ended June 30, 2016, the fair value of stock option awards was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values:
 
 
 
Six Months Ended
June 30, 2016
Weighted-average fair value of grant
 
$
4.53

Risk-free interest rate
 
1.29
%
Expected volatility
 
51.30
%
Expected life of options in years
 
4.90

Expected dividend yield
 

Summary of Stock Option Activity
A summary of stock option activity for the six months ended June 30, 2017 follows (shares in thousands):
 
Options
 
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016
 
2,099

 
$
25.41

 
 
 
 
Granted
 

 

 
 
 
 
Exercised
 
(1
)
 
10.65

 
 
 
 
Forfeited and expired
 
(306
)
 
20.04

 
 
 
 
Outstanding at June 30, 2017
 
1,792

 
26.33

 
2.09
 
$

Expected to vest at June 30, 2017
 
211

 
22.72

 
4.00
 

Exercisable at June 30, 2017
 
1,574

 
26.84

 
1.82
 

Summary of Restricted Stock Unit Activity
A summary of restricted stock unit activity for the six months ended June 30, 2017 follows (shares in thousands):
 
 
 
Restricted
Stock
Units
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2016
 
1,454

 
$
12.68

Granted
 
977

 
14.06

Vested
 
(544
)
 
13.30

Forfeited and expired
 
(162
)
 
11.41

Outstanding at June 30, 2017
 
1,725

 
13.46