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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Allowance for Doubtful Accounts and Other Accounts Receivable Allowance | The following is an analysis of the allowance for doubtful accounts and other accounts receivable allowances for the years ended December 31, 2020, 2019 and 2018:
(In thousands) |  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at January 1 |  | $ | 9,325 |  |  | $ | 9,654 |  |  | $ | 10,116 |
Provision charged to income |  |  | 864 |  |  |  | 29 |  |  |  | 764 |
Accounts written off, net of recoveries |  |  | (56 | ) |  |  | (358 | ) |  |  | (1,226 | )
Balance at December 31 |  | $ | 10,133 |  |  | $ | 9,325 |  |  | $ | 9,654 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + 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=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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