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Stock-Based Compensation Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Stock Based Compensation [Abstract]  
Stock-Based Compensation Expense and Related Tax Benefit [Table Text Block]
For the years ended December 31, stock-based compensation expense and the related tax benefit were as follows:
 
 
2012
 
2011
 
2010
 
(in thousands)
Stock options
$
1,547

 
$
1,445

 
$
3,994

Restricted stock units
16,583

 
13,842

 
14,230

Unrestricted stock awards
769

 
469

 
364

ESPP
613

 
655

 
519

Total stock-based compensation
$
19,512

 
$
16,411

 
$
19,107

 
 
 
 
 
 
Related tax benefit
$
5,377

 
$
4,478

 
$
5,402

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:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Dividend yield

 

 

Expected volatility
42.1
%
 
46.5
%
 
48.7
%
Risk-free interest rate
0.8
%
 
1.6
%
 
2.3
%
Expected life (years)
5.1

 
4.9

 
4.6

Employee Stock Options Activity [Table Text Block]
A summary of our stock option activity for the years ended December 31 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, 2010
1,179

 
$
52.93

 
5.90
 
$
22,863

 
 
Granted
71

 
61.97

 
 
 
 
 
$
27.18

Exercised
(148
)
 
40.51

 
 
 
$
4,532

 
 
Outstanding, December 31, 2010
1,102

 
$
55.21

 
5.58
 
$
10,883

 
 
 
 
 
 
 
 
 
 
 
 
Granted
113

 
$
51.12

 
 
 
 
 
$
21.38

Exercised
(42
)
 
19.71

 
 
 
$
1,283

 
 
Forfeited
(63
)
 
58.50

 
 
 
 
 
 
Expired
(1
)
 
7.00

 
 
 
 
 
 
Outstanding, December 31, 2011
1,109

 
$
55.97

 
4.51
 
$
2,323

 
 
 
 
 
 
 
 
 
 
 
 
Granted
196

 
$
43.27

 
 
 
 
 
$
16.51

Exercised
(54
)
 
21.91

 
 
 
$
1,078

 
 
Expired
(114
)
 
69.37

 
 
 
 
 
 
Outstanding, December 31, 2012
1,137

 
$
54.06

 
4.81
 
$
3,815

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2012
899

 
$
56.37

 
3.60
 
$
3,308

 
 
 
 
 
 
 
 
 
 
 
 
Expected to vest, December 31, 2012
222

 
$
45.49

 
9.35
 
$
468

 
 

(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 years ended December 31:

 
Number of
Restricted Stock Units
 
Weighted
Average  Grant
Date Fair Value
 
Aggregate
Intrinsic Value(1)
 
(in thousands)
 
 
 
(in thousands)
Outstanding, January 1, 2010
326

 
 
 
 
Granted(2)
360

 
$
62.45

 
 
Released
(84
)
 
 
 
$
5,733

Forfeited
(14
)
 
 
 
 
Outstanding, December 31, 2010
588

 
 
 
 
 
 
 
 
 
 
Granted(2)
355

 
$
54.71

 
 
Released
(271
)
 
 
 
$
20,413

Forfeited
(47
)
 
 
 
 
Outstanding, December 31, 2011
625

 
 
 
 
 
 
 
 
 
 
Granted
464

 
$
47.21

 
 
Released
(275
)
 
 
 
$
16,855

Forfeited
(40
)
 
 
 
 
Outstanding, December 31, 2012
774

 
 
 
 
 
 
 
 
 
 
Vested but not released, December 31, 2012
27

 
 
 
$
1,199

 
 
 
 
 
 
Expected to vest, December 31, 2012
700

 
 
 
$
31,198


(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 include 61,500 shares for the 2011 awards and 132,980 shares for the 2010 awards under the Performance Award Agreement, which are eligible for vesting at December 31 of each respective year.
Nonrestricted Stock Awards Activity [Table Text Block]
The following table summarizes unrestricted stock award activity for the years ended December 31:
 
 
2012
 
2011
 
2010
Shares of unrestricted stock granted
18,569

 
11,397

 
5,662

 
 
 
 
 
 
Weighted average grant date fair value per share
$
41.43

 
$
41.19

 
$
64.35

Employee Stock Purchase Plan (ESPP) Activity [Table Text Block]
The following table summarizes ESPP activity for the years ended December 31:

 
2012
 
2011
 
2010
Shares of stock sold to employees(1)
101,330

 
98,653

 
51,210

 
 
 
 
 
 
Weighted average fair value per ESPP award(2)
$
6.29

 
$
6.22

 
$
9.27


(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 periods during the years ended December 31.