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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in valuation and qualifying accounts |  |  |
Removal of tax valuation allowance for expiration of net operating loss carryforwards |  |  | $ 3,000
Removal of tax valuation allowance for Utilization of foreign tax credits |  |  | 27,000
Allowance for doubtful accounts |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | $ 2,339 | $ 4,564 | 10,877
Charged (credited) to costs and expenses | (56) | 1,564 | 103
Credited to other accounts | 154 |  |
(Deductions) Adjustments |  | (3,789) | (6,416)
Balance at end of period | 2,437 | 2,339 | 4,564
Tax valuation allowance |  |  |
Changes in valuation and qualifying accounts |  |  |
Balance at beginning of period | 329,523 | 328,397 | 368,672
Charged (credited) to costs and expenses | 6,162 | (3,016) | (11,090)
Credited to other accounts |  | 4,142 | (29,185)
(Deductions) Adjustments | (99,353) |  |
Balance at end of period | $ 236,332 | $ 329,523 | $ 328,397

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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