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Revenues (Notes)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenues	7. Revenues Revenues are recognized as control of the promised service is transferred to customers, in an amount that reflects the consideration expected in exchange for the services. The Company’s contracts have termination for convenience provisions and do not have substantive termination penalties; therefore, the contract duration for accounting purposes may be less than the stated terms. For accounting purposes, the Company's contracts with customers are considered to be of a short-term nature (one year or less). The Company does not disclose the value of remaining performance obligations for short-term contracts. The Company has contract liabilities for payments received in advance of providing services under certain contracts. Contract liabilities for advance payments were $3.8 million and $9.8 million at March 31, 2019 and December 31, 2018, respectively. Contract liabilities are included in other current liabilities on the condensed consolidated balance sheets. During the three months ended March 31, 2019, the Company recognized revenues of $8.8 million relating to amounts that were included in contract liabilities as of December 31, 2018. The allowance for doubtful accounts was $4.6 million at March 31, 2019 and $4.8 million at December 31, 2018.

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- References

No definition available.

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- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-URI http://asc.fasb.org/topic&trid=2122369

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