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Certain Balance Sheet Components (Tables) | 6 Months Ended
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Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Accounts Receivable, Net |
Accounts receivable, net |  |  |
In thousands | June 30, 2019 |  | December 31, 2018
Trade receivables (net of allowance of $4,360 and $6,331) | $ | 426,936 |  |  | $ | 416,503 |
Unbilled receivables | 39,430 |  |  | 20,658 |
Total accounts receivable, net | $ | 466,366 |  |  | $ | 437,161 |
Allowance for Credit Losses on Financing Receivables |
Allowance for doubtful accounts activity | Three Months Ended June 30, |  | Six Months Ended June 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Beginning balance | $ | 4,046 |  |  | $ | 4,774 |  |  | $ | 6,331 |  |  | $ | 3,957 |
Provision for doubtful accounts, net | 365 |  |  | 334 |  |  | (1,738 | ) |  | 1,254 |
Accounts written-off | (80 | ) |  | (247 | ) |  | (272 | ) |  | (505 | )
Effect of change in exchange rates | 29 |  |  | (309 | ) |  | 39 |  |  | (154 | )
Ending balance | $ | 4,360 |  |  | $ | 4,552 |  |  | $ | 4,360 |  |  | $ | 4,552 |
Inventories |
Inventories |  |  |
In thousands | June 30, 2019 |  | December 31, 2018
Materials | $ | 127,219 |  |  | $ | 133,398 |
Work in process | 10,888 |  |  | 9,744 |
Finished goods | 91,803 |  |  | 77,532 |
Total inventories | $ | 229,910 |  |  | $ | 220,674 |
Property, Plant, and Equipment, Net |
Property, plant, and equipment, net |  |  |
In thousands | June 30, 2019 |  | December 31, 2018
Machinery and equipment | $ | 321,155 |  |  | $ | 315,974 |
Computers and software | 108,110 |  |  | 104,290 |
Buildings, furniture, and improvements | 148,026 |  |  | 146,071 |
Land | 15,201 |  |  | 14,980 |
Construction in progress, including purchased equipment | 51,100 |  |  | 49,682 |
Total cost | 643,592 |  |  | 630,997 |
Accumulated depreciation | (415,079 | ) |  | (404,446 | )
Property, plant, and equipment, net | $ | 228,513 |  |  | $ | 226,551 |
Depreciation Expense |
Depreciation expense | Three Months Ended June 30, |  | Six Months Ended June 30,
In thousands | 2019 |  | 2018 |  | 2019 |  | 2018
Depreciation expense | $ | 12,594 |  |  | $ | 12,908 |  |  | $ | 24,978 |  |  | $ | 26,240 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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