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Operations and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of financial instruments
The balance of the Company’s primary financial instruments was as follows:
 
(in thousands)
At December 31,
 
2016
2015
United States Treasury securities and money market funds
$
2,832

$
76,047
Schedule of estimated useful lives over which depreciation of software, machinery and equipment is provided for using accelerated methods
Depreciation of software, machinery and equipment is provided using accelerated methods over the following estimated useful lives: 
Software
3 to 5 years
Machinery and equipment
3 to 10 years
Schedule of Restructuring Reserve by Type of Cost
The following table provides a rollforward of the liability balance for such expenses, as well as other non-employee costs associated with the Asia sales office closing, as of December 31, 2016:
(in thousands)
Operating Leases Obligation
 
Employee Severance Obligation
 
 Other Associated Costs
 
 Total
 Balance at January 1, 2016
$
—

 
$
301

 
$
352

 
$
653

Charges
406

 
441

 
98

 
945

Cash payments
(406
)
 
(742
)
 
(413
)
 
(1,561
)
Balance at December 31, 2016
$
—

 
$
—

 
$
37

 
$
37
Reconciliation of basic earnings per share ("EPS") to diluted EPS
The following shows a reconciliation of basic earnings per share (“EPS”) to diluted EPS:
 
 
Fiscal Year Ended December 31,
 (in thousands, except per-share amounts)
2016
 
2015
 
2014
Net income available to common stockholders
$
89,734

 
$
67,888

 
$
63,531

 
 
 
 
 
 
Basic weighted average shares outstanding
48,084

 
48,952

 
48,977

Dilutive effect of potential common stock equivalents
211

 
229

 
217

Diluted weighted average shares outstanding
48,295

 
49,181

 
49,194

Net earnings per share:
 

 
 

 
 

Basic
$
1.87

 
$
1.39

 
$
1.30

Diluted
$
1.86

 
$
1.38

 
$
1.29

Potentially dilutive securities excluded from earnings per diluted share because their
 
 
 
 
 
effect is anti-dilutive
—

 
—

 
—
Schedule of components of accumulated other comprehensive income
The following shows the components of accumulated other comprehensive income or loss as of December 31, 2016 and 2015, respectively:

 
Foreign Currency Translation
 
Pension Benefit
 
Total
(in thousands)
 
 
Balance, January 1, 2014
$
18,283

 
$
(197
)
 
$
18,086

Other comprehensive income before reclassification net of tax benefit (expense) of ($63) and $67, respectively
(24,896
)
 
(370
)
 
(25,266
)
Balance, December 31, 2014
(6,613
)
 
(567
)
 
(7,180
)
Other comprehensive loss net of tax benefit (expense) of ($57) and $82, respectively
(20,708
)
 
(457
)
 
(21,165
)
Amounts reclassified from accumulative other comprehensive income, net of $0 tax
(231
)
 
—

 
(231
)
Balance, December 31, 2015
(27,552
)
 
(1,024
)
 
(28,576
)
Other comprehensive loss net of tax benefit (expense) of ($222) and $87, respectively
(3,920
)
 
(474
)
 
(4,394
)
Amounts reclassified from accumulative other comprehensive income, net of $0 tax
—

 
—

 
—

Balance, December 31, 2016
$
(31,472
)
 
$
(1,498
)
 
$
(32,970
)
Schedule of Company's stock-based compensation activity
The following table shows the Company’s stock-based compensation activity:

 
Fiscal Years Ended December 31,
(in thousands) 
2016
 
2015
 
2014
Stock-based compensation expense recognized in operating expenses
$
13,113

 
$
11,212

 
$
12,299

Tax benefit of stock-based compensation expense in provision for income taxes
4,757

 
3,987

 
4,384

Stock-based compensation expense, net of tax
$
8,356

 
$
7,225

 
$
7,915

Fair value of shares vested
$
13,186

 
$
10,997

 
$
12,354

Proceeds to the Company from the exercise of stock-based compensation
$
7,976

 
$
9,720

 
$
4,582

Tax benefit from exercise of stock-based compensation, including shortfall tax benefits
$
(251
)
 
$
(318
)
 
$
(268
)

The stock-based compensation expense included in cost of sales, research and development and engineering expense, selling expense, or general and administrative expense depends on the job functions performed by the employees to whom the stock options were granted, or the restricted stock units were awarded.

The following table shows the expense related to the Company's stock-based compensation capitalized in inventory.
  
 
At The Fiscal Year Ended December 31,
(in thousands)
2016
 
2015
 
2014
Stock-based compensation cost capitalized in inventory
$
434

 
$
368

 
$
559
Schedule of changes in the carrying amount of goodwill, by segment
The annual changes in the carrying amount of goodwill, by segment, as of December 31, 2015 and 2016, were as follows, respectively:

(in thousands)
North
America
 
Europe
 
Asia
Pacific
 
Total
Balance as of January 1, 2015:
 
 
 
 
 
 
 
Goodwill
$
95,192

 
$
51,202

 
$
1,567

 
$
147,961

Accumulated impairment losses
(10,666
)
 
(13,414
)
 
—

 
(24,080
)
 
84,526

 
37,788

 
1,567

 
123,881

Goodwill acquired
1,860

 
210

 
—

 
2,070

Foreign exchange
(552
)
 
(1,278
)
 
(171
)
 
(2,001
)
Balance as of December 31, 2015:
 
 
 
 
 
 
0

Goodwill
96,500

 
50,135

 
1,396

 
148,031

Accumulated impairment losses
(10,666
)
 
(13,415
)
 
—

 
(24,081
)
 
85,834

 
36,720

 
1,396

 
123,950

Goodwill acquired
—

 
1,848

 
—

 
1,848

Foreign exchange
93

 
(952
)
 
(21
)
 
(880
)
Reclassifications(1)
(439
)
 
—

 
—

 
(439
)
Balance as of December 31, 2016:
 
 
 
 
 
 
0

Goodwill
96,154

 
51,031

 
1,375

 
148,560

Accumulated impairment losses
(10,666
)
 
(13,415
)
 
—

 
(24,081
)
 
$
85,488

 
$
37,616

 
$
1,375

 
$
124,479

 (1) Reclassifications in 2016 of $0.2 million in patents, $0.1 million in non-compete agreements, $46 thousand in customer relationships and other assets, with a corresponding $0.4 million decrease in goodwill related to the EBTY acquisition.
Schedule of changes in the carrying amounts of finite-lived intangible assets subject to amortization
The annual changes in the carrying amounts of patents, unpatented technologies, customer relationships and non-compete agreements and other intangible assets subject to amortization as of December 31, 2015, and 2016 were as follows, respectively:
 
(in thousands)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Patents
 
 
Balance at January 1, 2015
$
1,758

 
$
(1,577
)
 
$
181

Acquisition
1,062

 
—

 
$
1,062

Amortization
—

 
(102
)
 
(102
)
Foreign exchange
(7
)
 
—

 
(7
)
Removal of fully amortized assets
(1,300
)
 
1,300

 
—

Balance, at December 31, 2015
1,513

 
(379
)
 
1,134

Amortization
—

 
(149
)
 
(149
)
Reclassifications (1)
212

 
—

 
212

Foreign exchange
(7
)
 
—

 
(7
)
Balance at December 31, 2016
$
1,718

 
$
(528
)
 
$
1,190

 (1) Reclassifications in 2016 of $0.2 million in patents, $0.1 million in non-compete agreements, $46 thousand in customer relationships and other assets, with a corresponding $0.4 million decrease in goodwill related to the EBTY acquisition.

(in thousands)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Unpatented Technology
 
 
Balance at January 1, 2015
$
22,797

 
$
(7,665
)
 
$
15,132

Amortization
—

 
(2,061
)
 
(2,061
)
Foreign exchange
(123
)
 
—

 
(123
)
Removal of fully amortized assets
(1,070
)
 
1,070

 
—

Balance, at December 31, 2015
21,604

 
(8,656
)
 
12,948

Amortization
—

 
(2,058
)
 
(2,058
)
Reclassifications (2)
1,512

 
—

 
1,512

Foreign exchange
(243
)
 
$
—

 
(243
)
Removal of fully amortized assets
(1,711
)
 
1,711

 
—

Balance at December 31, 2016
$
21,162

 
$
(9,003
)
 
$
12,159

 (2)         Reclassifications in 2016 of $1.5 million in unpatented technology for completed IPR&D, with a corresponding reduction in indefinite-lived IPR&D intangibles.
(in thousands)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Non-Compete Agreements,
Trademarks and Other
 
 
 
 
Balance at January 1, 2015
$
10,839

 
(5,374
)
 
5,465

Acquisition
25

 
—

 
25

Amortization
—

 
(2,039
)
 
(2,039
)
Foreign exchange
(76
)
 
—

 
(76
)
Removal of fully amortized assets
(210
)
 
210

 
—

Balance, at December 31, 2015
10,578

 
(7,203
)
 
3,375

Acquisition
1,212

 
—

 
1,212

Amortization
—

 
(2,040
)
 
(2,040
)
Reclassifications (1)
119

 
—

 
119

Foreign exchange
(39
)
 
—

 
(39
)
Removal of fully amortized asset
(5,143
)
 
5,143

 
—

Balance at December 31, 2016
$
6,727

 
$
(4,100
)
 
$
2,627

  (1) Reclassifications in 2016 of $0.2 million in patents, $0.1 million in non-compete agreements, $46 thousand in customer relationships and other assets, with a corresponding $0.4 million decrease in goodwill related to the EBTY acquisition.
(in thousands)
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Customer Relationships
 
 
Balance at January 1, 2015
$
21,346

 
(11,671
)
 
9,675

Acquisition
474

 
—

 
474

Amortization
—

 
(1,881
)
 
(1,881
)
Foreign exchange
(178
)
 
—

 
(178
)
Removal of fully amortized assets
(400
)
 
400

 
—

Balance, at December 31, 2015
21,242

 
(13,152
)
 
8,090

Amortization
—

 
(1,793
)
 
(1,793
)
Reclassifications (1)
46

 
—

 
46

Foreign exchange
(71
)
 
—

 
(71
)
Balance at December 31, 2016
$
21,217

 
$
(14,945
)
 
$
6,272

   (1) Reclassifications in 2016 of $0.2 million to patents, $0.1 million in non-compete agreements, $46 thousand in customer relationships and other assets, with a corresponding $0.4 million decrease in goodwill related to the EBTY acquisition.
Schedule of estimated future amortization of intangible assets
At December 31, 2016, estimated future amortization of intangible assets was as follows:
 
(in thousands) 
2017
$
4,728

2018
3,526

2019
3,447

2020
3,416

2021
2,937

Thereafter
4,194

 
$
22,248
Schedule of changes in the carrying amounts of indefinite-lived trade name and IPR&D assets not subject to amortization
The annual changes in the carrying amounts of indefinite-lived trade name and IPR&D assets not subject to amortization as of December 31, 2015 and 2016, respectively, were as follows: 
(in thousands)
 
 
 
 
Net
Carrying
Indefinite-Lived Intangibles
Trade Name
 
IPR&D
 
Amount
Balance, at January 1, 2015
$
616

 
$
1,518

 
$
2,134

Reclassifications
—

 
—

 
—

Foreign exchange
—

 
(6
)
 
(6
)
Balance, at December 31, 2015
616

 
1,512

 
2,128

Reclassifications (2)
—

 
(1,512
)
 
(1,512
)
Foreign exchange
—

 
—

 
—

Balance at December 31, 2016
$
616

 
$
—

 
$
616

 (2)         Reclassifications in 2016 of $1.5 million to unpatented technology for completed IPR&D, with a corresponding reduction in indefinite-lived IPR&D intangibles.
Schedule of amortizable and indefinite-lived assets, net, by segment
Amortizable and indefinite-lived assets, net, by segment, as of December 31, 2015 and 2016, respectively, were as follows: 
 
December 31, 2015
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
(in thousands)
 
 
Total Intangible Assets
 
 
North America
$
27,475

 
$
(14,941
)
 
$
12,534

Europe
29,590

 
(14,449
)
 
15,141

Total
$
57,065

 
$
(29,390
)
 
$
27,675


 
At December 31, 2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
(in thousands)
 
 
Total Intangible Assets
 
 
North America
$
23,562

 
$
(13,811
)
 
$
9,751

Europe
27,880

 
(14,767
)
 
13,113

Total
$
51,442

 
$
(28,578
)
 
$
22,864