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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
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:

 
2016
 
2015
 
2014
 
(in thousands)
Stock options
$
2,357

 
$
2,648

 
$
2,333

Restricted stock units
14,723

 
10,735

 
14,591

Unrestricted stock awards
955

 
706

 
936

Phantom stock units
1,077

 
—

 
—

Total stock-based compensation
$
19,112

 
$
14,089

 
$
17,860

 
 
 
 
 
 
Related tax benefit
$
4,927

 
$
4,228

 
$
4,994
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,
 
2016
 
2015
 
2014
Dividend yield
—

 
—

 
—

Expected volatility
33.5
%
 
34.3
%
 
39.3
%
Risk-free interest rate
1.3
%
 
1.7
%
 
1.7
%
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, 2014
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

 
 
 
 
 
 
 
 
 
 
 
 
Granted
191

 
$
40.40

 
 
 
 
 
$
13.27

Exercised
(58
)
 
37.00

 
 
 
$
742

 
 
Forfeited
(36
)
 
35.29

 
 
 
 
 
 
Expired
(318
)
 
55.13

 
 
 
 
 
 
Outstanding, December 31, 2016
959

 
$
45.64

 
6.6
 
$
19,125

 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2016
562

 
$
51.18

 
5.1
 
$
9,181

 
 
 
 
 
 
 
 
 
 
 
 
Expected to vest, December 31, 2016
385

 
$
37.76

 
8.7
 
$
9,658

 
 

(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,
 
2016
 
2015
 
2014
Dividend yield
—

 
—

 
—

Expected volatility
30.0
%
 
30.1
%
 
32.3
%
Risk-free interest rate
0.7
%
 
0.7
%
 
0.4
%
Expected term (years)
1.8

 
2.1

 
2.0

 
 
 
 
 
 
Weighted-average grant date fair value
$
44.92

 
$
33.48

 
$
35.15
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, 2014
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

 
 
 
 
 
 
 
 
 
 
Granted (4)
306

 
$
41.58

 
 
Released
(312
)
 
 
 
$
11,944

Forfeited
(82
)
 
 
 
 
Outstanding, December 31, 2016
668

 
 
 
 
 
 
 
 
 
 
Vested but not released, December 31, 2016
115

 
 
 
$
7,242

 
 
 
 
 
 
Expected to vest, December 31, 2016
477

 
 
 
$
30,006


(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 2013 Performance Award Agreement, which are eligible for distribution at December 31, 2015.

(4) 
Restricted stock units include 110,259 shares for the 3-year award under the 2014 Performance Award Agreement, which are eligible for distribution at December 31, 2016.
Unrestricted Stock Awards Activity [Table Text Block]
The following table summarizes unrestricted stock award activity for the years ended December 31:

 
2016
 
2015
 
2014
 
(in thousands, except per share data)
Shares of unrestricted stock granted
21

 
20

 
24

 
 
 
 
 
 
Weighted average grant date fair value per share
$
44.94

 
$
35.01

 
$
39.06
Schedule of Other Share-based Compensation, Activity [Table Text Block]
The following table summarizes phantom stock unit activity:

 
Number of Phantom Stock Units
 
Weighted
Average Grant
Date Fair Value
 
(in thousands)
 
 
Outstanding, January 1, 2016
—

 
 
Granted
63

 
$
40.11

Forfeited
(1
)
 
 
Outstanding, December 31, 2016
62

 
 
 
 
 
 
Expected to vest, December 31, 2016
57

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

 
2016
 
2015
 
2014
 
(in thousands)
Shares of stock sold to employees(1)
20

 
54

 
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.