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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-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:

 
2015
 
2014
 
2013
 
(in thousands)
Stock options
$
2,648

 
$
2,333

 
$
2,074

Restricted stock units
10,735

 
14,591

 
15,475

Unrestricted stock awards
706

 
936

 
811

ESPP
—

 
—

 
490

Total stock-based compensation
$
14,089

 
$
17,860

 
$
18,850

 
 
 
 
 
 
Related tax benefit
$
4,228

 
$
4,994

 
$
5,152
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,
 
2015
 
2014
 
2013
Dividend yield
—

 
—

 
—

Expected volatility
34.3
%
 
39.3
%
 
38.1
%
Risk-free interest rate
1.7
%
 
1.7
%
 
1.0
%
Expected term (years)
5.5

 
5.5

 
5.5
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, 2013
1,137

 
$
54.06

 
4.8
 
$
3,815

 
 
Granted
129

 
42.76

 
 
 
 
 
$
15.44

Exercised
(74
)
 
23.87

 
 
 
1,377

 
 
Expired
(12
)
 
49.04

 
 
 
 
 
 
Outstanding, December 31, 2013
1,180

 
$
54.79

 
4.6
 
$
1,300

 
 
 
 
 
 
 
 
 
 
 
 
Granted
160

 
$
35.65

 
 
 
 
 
$
13.65

Exercised
(67
)
 
28.03

 
 
 
$
826

 
 
Forfeited
(7
)
 
44.06

 
 
 
 
 
 
Expired
(143
)
 
68.97

 
 
 
 
 
 
Outstanding, December 31, 2014
1,123

 
$
51.90

 
4.4
 
$
1,676

 
 
 
 
 
 
 
 
 
 
 
 
Granted
291

 
$
35.25

 
 
 
 
 
$
12.09

Exercised
(24
)
 
36.05

 
 
 
$
26

 
 
Forfeited
(17
)
 
37.47

 
 
 
 
 
 
Expired
(193
)
 
52.17

 
 
 
 
 
 
Outstanding, December 31, 2015
1,180

 
$
48.31

 
5.7
 
$
405

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2015
759

 
$
55.15

 
3.8
 
$
48

 
 
 
 
 
 
 
 
 
 
 
 
Expected to vest, December 31, 2015
407

 
$
36.01

 
8.9
 
$
343

 
 

(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.
Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]
The weighted-average assumptions used to estimate the fair value of performance-based restricted stock units granted and the resulting weighted average fair-value are as follows:

 
Year Ended December 31,
 
2015
 
2014
 
2013
Dividend yield
—

 
—

 
—

Expected volatility
30.1
%
 
32.3
%
 
39.1
%
Risk-free interest rate
0.7
%
 
0.4
%
 
0.3
%
Expected term (years)
2.1

 
2.0

 
2.5

 
 
 
 
 
 
Weighted-average fair value
$
33.48

 
$
35.15

 
$
45.03
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, 2013
774

 
 
 
 
Granted
255

 
$
42.51

 
 
Released
(331
)
 
 
 
$
17,983

Forfeited
(40
)
 
 
 
 
Outstanding, December 31, 2013
658

 
 
 
 
 
 
 
 
 
 
Granted(2)
350

 
$
35.74

 
 
Released
(291
)
 
 
 
$
14,402

Forfeited
(35
)
 
 
 
 
Outstanding, December 31, 2014
682

 
 
 
 
 
 
 
 
 
 
Granted(3)
434

 
$
35.09

 
 
Released
(296
)
 
 
 
$
12,204

Forfeited
(64
)
 
 
 
 
Outstanding, December 31, 2015
756

 
 
 
 
 
 
 
 
 
 
Vested but not released, December 31, 2015
21

 
 
 
$
746

 
 
 
 
 
 
Expected to vest, December 31, 2015
604

 
 
 
$
21,860


(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) 
Restricted stock units include 14,433 shares for the 2-year award under the 2013 Performance Award Agreement, which are eligible for distribution at December 31, 2014.

(3) 
Restricted stock units include 15,648 shares for the 3-year award under the 2014 Performance Award Agreement, which are eligible for distribution at December 31, 2015.
Unrestricted Stock Awards Activity [Table Text Block]
The following table summarizes unrestricted stock award activity for the years ended December 31:

 
2015
 
2014
 
2013
 
(in thousands, except per share data)
Shares of unrestricted stock granted
20

 
24

 
18

 
 
 
 
 
 
Weighted average grant date fair value per share
$
35.01

 
$
39.06

 
$
44.12
Employee Stock Purchase Plan (ESPP) Activity [Table Text Block]
The following table summarizes ESPP activity for the years ended December 31:

 
2015
 
2014
 
2013
 
(in thousands, except per share data)
Shares of stock sold to employees(1)
54

 
61

 
94

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

 
$
—

 
$
6.61


(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. Effective October 1, 2013, the ESPP is no longer compensatory and therefore the 2013 weighted average fair value per award is for the nine months ended September 30, 2013.