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Revenues (Notes)	6 Months Ended
Revenues (Notes)	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenues	8. 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 $8.9 million and $9.8 million at June 30, 2019 and December 31, 2018, respectively. Contract liabilities are included in other current liabilities on the condensed consolidated balance sheets and are generally recognized as revenues within three months from the balance sheet date. The allowance for doubtful accounts was $4.7 million at June 30, 2019 and $4.8 million at December 31, 2018.