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Certain Balance Sheet Components | 6 Months Ended
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Jun. 30, 2019
Balance Sheet Related Disclosures [Abstract] |
Certain Balance Sheet Components | Certain Balance Sheet Components A summary of accounts receivable from contracts with customers is as follows:
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 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 |  |  |
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 |  |  |
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 | 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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- References No definition available. + Details
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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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