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Schedule II - Valuation and Qualifying Accounts - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member] |  |  |  |
Allowance for doubtful accounts |  | $ 4,606 | $ 3,163 | $ 1,794
Allowance for doubtful accounts |  | 2,171 | 2,400 | 1,917
Allowance for doubtful accounts | [1] | 0 |  | 167
Allowance for doubtful accounts | [2] | (1,431) | (957) | (715)
Allowance for doubtful accounts |  | 5,346 | 4,606 | 3,163
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] |  |  |  |
Allowance for doubtful accounts |  | 75 | 1,532 | 1,683
Allowance for doubtful accounts |  | (75) | (1,457) | 0
Allowance for doubtful accounts | [1] | 0 | 0 | 0
Allowance for doubtful accounts | [2] | 0 |  | (151)
Allowance for doubtful accounts |  |  | $ 75 | $ 1,532
[1] | In 2016, the change in the allowance for doubtful accounts represents the fair value of balances assumed in acquisition transactions. See Note 3 Acquisitions and Dispositions of the notes to our audited consolidated financial statements included elsewhere herein for further information.
[2] | Deductions from allowance for doubtful accounts represent write-offs of receivable balances not considered collectible. The deduction from the valuation allowance for deferred tax assets represents changes in estimates of our future taxable income and our estimated future usage of certain net operating loss carryforwards, as well as expiration of certain net operating loss carryforwards.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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