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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Statement of Financial Position [Abstract] |  |  |
Allowance for Doubtful Accounts Receivable, Current | $ 4,405 | $ 8,893 | $ 10,734
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | $ 604,233 | $ 602,660 | $ 585,104
Preferred Stock, Shares Authorized | 10,000 | 10,000 | 10,000
Preferred Stock, Shares Outstanding | 0 | 0 | 0
Preferred Stock, Shares Issued | 0 | 0 | 0
Common Stock, Shares Authorized | 250,000 | 250,000 |
Common Stock, Shares, Issued | 62,091 | 65,164 | 66,148

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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