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Schedule II - Valuation and Qualifying Accounts and Reserves | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts and Reserves | SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (IN THOUSANDS)
| For the Year Ended December 31, 2019
| Balance at beginning of period |  | Additions charged to costs and expenses |  | Acquisitions |  | Accounts written off |  | Translation adjustments |  | Balance at end of period
Allowance for doubtful accounts | $ | 9,173 |  |  | $ | 1,262 |  |  | $ | — |  |  | $ | (2,024 | ) |  | $ | (180 | ) |  | $ | 8,231 |
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets | 200,280 |  |  | 5,659 |  |  | — |  |  | — |  |  | (2,174 | ) |  | 203,765 |
| For the Year Ended December 31, 2018
| Balance at beginning of period |  | Additions (deductions) charged to costs and expenses |  | Acquisitions |  | Accounts written off |  | Translation adjustments |  | Balance at end of period
Allowance for doubtful accounts | $ | 13,392 |  |  | $ | 1,286 |  |  | $ | — |  |  | $ | (4,642 | ) |  | $ | (863 | ) |  | $ | 9,173 |
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets | 207,483 |  |  | (1,821 | ) | (1) | 3,887 |  |  | — |  |  | (9,269 | ) |  | 200,280 |
| For the Year Ended December 31, 2017
| Balance at beginning of period |  | Additions charged to costs and expenses |  | Acquisitions |  | Accounts written off |  | Translation adjustments |  | Balance at end of period
Allowance for doubtful accounts | $ | 9,995 |  |  | $ | 3,798 |  |  | $ | — |  |  | $ | (1,496 | ) |  | $ | 1,095 |  |  | $ | 13,392 |
Valuation allowance on credit and operating loss carryforwards and other net deferred tax assets | 152,752 |  |  | 35,646 |  | (2) | — |  |  | — |  |  | 19,085 |  |  | 207,483 |
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(1) | The 2018 amount includes an adjustment to the 2017 foreign net operating loss carryforwards in the amount of $5.9 million.
(2) The 2017 amount includes an adjustment to the 2016 foreign net operating loss carryforwards in the amount of $58.8 million

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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