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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015:
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at January 1 |  | $ | 9,755 |  |  | $ | 8,046 |  |  | $ | 10,011 |
Provision charged to income |  |  | 45 |  |  |  | 1,917 |  |  |  | 1,106 |
Accounts written off, net of recoveries |  |  | 316 |  |  |  | (208 | ) |  |  | (3,071 | )
Balance at December 31 |  | $ | 10,116 |  |  | $ | 9,755 |  |  | $ | 8,046 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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