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Revenue (Tables)
12 Months Ended
Dec. 31, 2021
Revenue.  
Schedule of revenue by discipline

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Year ended

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December 31,

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2021

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2020

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2019

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(in thousands)

Systems

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​

$

454,598

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$

293,624

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$

202,571

Aftermarket

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​

​

207,830

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​

180,936

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​

140,387

Total Revenue

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​

$

662,428

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$

474,560

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$

342,958

Schedule of revenue by geographic markets

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Year ended

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December 31,

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2021

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2020

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2019

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(in thousands)

North America

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$

48,715

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$

50,786

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$

36,206

Asia Pacific

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516,105

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​

385,233

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​

251,020

Europe

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​

97,608

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​

38,541

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​

55,732

Total Revenue

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​

$

662,428

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$

474,560

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$

342,958

Schedule of Contract liabilities

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Year ended

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December 31,

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2021

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2020

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2019

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(in thousands)

Balance, beginning of the period

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$

23,058

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$

29,251

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$

22,584

Deferral of revenue

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​

66,349

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​

17,862

​

​

24,403

Recognition of deferred revenue

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(20,971)

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(24,055)

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​

(17,736)

Balance, end of the period

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$

68,436

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$

23,058

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$

29,251