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Stock-Based Compensation Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2012
Stock Based Compensation [Abstract] [Abstract]  
Stock-Based Compensation Expense and Related Tax Benefit [Table Text Block]
For the three and nine months ended September 30, stock-based compensation expense and the related tax benefit were as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
 
(in thousands)
Stock options
$
333

 
$
(320
)
 
$
942

 
$
1,224

Restricted stock units
4,390

 
2,916

 
12,281

 
10,320

Unrestricted stock awards
179

 
140

 
589

 
330

ESPP
161

 
147

 
507

 
527

Total stock-based compensation
$
5,063

 
$
2,883

 
$
14,319

 
$
12,401

 
 
 
 
 
 
 
 
Related tax benefit
$
1,358

 
$
700

 
$
3,922

 
$
3,359

Stock Options, Valuation Assumptions [Table Text Block]
The fair values of stock options granted were estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012(1)
 
2011
 
2012
 
2011
Dividend yield

 

 

 

Expected volatility
%
 
45.8
%
 
42.7
%
 
46.4
%
Risk-free interest rate
%
 
0.9
%
 
0.9
%
 
1.7
%
Expected life (years)

 
4.91

 
5.14

 
4.86


(1) There were no employee stock options granted for the three months ended September 30, 2012.
Employee Stock Options Activity [Table Text Block]
A summary of our stock option activity for the nine months ended September 30 is as follows:
 

Shares
 
Weighted
Average Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Life
 
Aggregate
Intrinsic Value (1)
 
Weighted
Average Grant
Date Fair Value
 
(in thousands)
 
 
 
(years)
 
(in thousands)
 
 
Outstanding, January 1, 2011
1,102

 
$
55.21

 
5.58

 
$
10,883

 
 
Granted
103

 
52.13

 
 
 
 
 
$
21.81

Exercised
(29
)
 
19.53

 
 
 
$
1,050

 
 
Forfeited
(63
)
 
58.50

 
 
 
 
 
 
Expired
(1
)
 
7.00

 
 
 
 
 
 
Outstanding, September 30, 2011
1,112

 
$
55.72

 
4.68

 
$
1,518

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, September 30, 2011
1,027

 
$
55.94

 
4.30

 
$
1,518

 
 
 
 
 
 
 
 
 
 
 
 
Expected to vest, September 30, 2011
80

 
$
53.19

 
9.28

 
$

 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, January 1, 2012
1,109

 
$
55.97

 
4.51

 
$
2,323

 
 
Granted
54

 
48.23

 
 
 
 
 
$
18.64

Exercised
(50
)
 
22.12

 
 
 
$
972

 
 
Expired
(83
)
 
60.06

 
 
 
 
 
 
Outstanding, September 30, 2012
1,030

 
$
56.87

 
4.35

 
$
3,127

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, September 30, 2012
904

 
$
58.04

 
3.72

 
$
2,969

 
 
 
 
 
 
 
 
 
 
 
 
Expected to vest, September 30, 2012
119

 
$
48.50

 
8.89

 
$
149

 
 

(1) 
The aggregate intrinsic value of outstanding stock options represents amounts that would have been received by the optionees had all in- the-money options been exercised on that date. Specifically, it is the amount by which the market value of Itron’s stock exceeded the exercise price of the outstanding in-the-money options before applicable income taxes, based on our closing stock price on the last business day of the period. The aggregate intrinsic value of stock options exercised during the period is calculated based on our stock price at the date of exercise.
Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes restricted stock unit activity for the nine months ended September 30:

 
Number of
Restricted Stock Units
 
Weighted
Average  Grant
Date Fair Value
 
Aggregate
Intrinsic Value(1)
 
(in thousands)
 
 
 
(in thousands)
Outstanding, January 1, 2011
588

 
 
 
 
Granted(2)
286

 
$
54.82

 
 
Released
(201
)
 
 
 
$
15,739

Forfeited
(37
)
 
 
 
 
Outstanding, September 30, 2011
636

 
 
 
 
 
 
 
 
 
 
Outstanding, January 1, 2012
625

 
 
 
 
Granted(2)
452

 
$
47.29

 
 
Released
(207
)
 
 
 
$
12,835

Forfeited
(34
)
 
 
 
 
Outstanding, September 30, 2012
836

 
 
 
 
 
 
 
 
 
 
Vested, September 30, 2012
48

 
 
 
$
2,049

 
 
 
 
 
 
Expected to vest, September 30, 2012
763

 
 
 
$
32,904


(1) 
The aggregate intrinsic value is the market value of the stock, before applicable income taxes, based on the closing price on the stock release dates or at the end of the period for restricted stock units expected to vest.

(2) 
These restricted stock units do not include the respective 2011 and 2012 awards under the Performance Award Agreement, which are not eligible for vesting as of September 30 of each respective year.
Nonrestricted Stock Awards Activity [Table Text Block]
The following table summarizes unrestricted stock award activity for the three and nine months ended September 30:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Shares of unrestricted stock granted
4,342

 
2,864

 
14,321

 
6,317

 
 
 
 
 
 
 
 
Weighted average grant date fair value per share
$
41.41

 
$
48.84

 
$
41.16

 
$
52.19

Employee Stock Purchase Plan (ESPP) Activity [Table Text Block]
The following table summarizes ESPP activity for the three and nine months ended September 30:

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Shares of stock sold to employees(1)
22,739

 
22,518

 
76,415

 
65,143

 
 
 
 
 
 
 
 
Weighted average fair value per ESPP award(2)
$
6.47

 
$
4.43

 
$
6.52

 
$
5.56


(1) 
Stock sold to employees during each fiscal quarter under the ESPP is associated with the offering period ending on the last day of the previous fiscal quarter.

(2) 
Relating to awards associated with the offering period during the three and nine months ended September 30.