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Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Schedule II - Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II Valuation and Qualifying Accounts (in thousands); Years Ended December 31, 2017, 2016, and 2015
Valuation Accounts Deducted in the Balance Sheet From the Assets to Which They Apply |  | Balance at Beginning of Period |  |  | Additions Charged to Costs and Expenses |  |  | Additions Recorded During Acquisitions |  |  | Deductions (A) |  |  | Balance at End of Period |
2015 Allowance for losses: Trade accounts receivable |  | $ | 3,838 |  |  | $ | 1,459 |  |  | $ | 0 |  |  | $ | 1,426 |  |  | $ | 3,871 |
2016 Allowance for losses: Trade accounts receivable |  | $ | 3,871 |  |  | $ | 1,747 |  |  | $ | 0 |  |  | $ | 782 |  |  | $ | 4,836 |
2017 Allowance for losses: Trade accounts receivable |  | $ | 4,836 |  |  | $ | 1,276 |  |  | $ | 0 |  |  | $ | 112 |  |  | $ | 6,000 |
(A) Accounts written off, net of recoveries. |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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