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v3.19.1

Allowance for Doubtful Accounts | 3 Months Ended
--- | ---
Mar. 31, 2019
Allowance for Doubtful Accounts |
Allowance for Doubtful Accounts | 7. Allowance for Doubtful Accounts
|  | Balance at |  |  |  |  |  | Balance at
|  | Beginning of |  | Charged to |  | Deductions/ |  | End of
|  | Period |  | Expense |  | Transfers(1) |  | Period
Allowance for doubtful accounts receivable |  |  |  |  |  |  |  |  |  |
Three months ended March 31, 2019 |  | $ | — |  | — |  | — |  | $ | —
Three months ended March 31, 2018 |  | $ | 5,907 |  | 4,997 |  | (3,722) |  | $ | 7,182
| (1) |  | Deductions represent accounts written off, net of recoveries.

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- Definition The entire disclosure for allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
Name: | us-gaap_AllowanceForCreditLossesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration