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Revenue from Contracts with Customers - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Contract terms | Generally, contracts are billed in arrears on a quarterly basis and have a three year duration, after which the customer can terminate the agreement with a three to twelve month notice.
Disaggregation of Revenue [Line Items] |
Termination period | 60 days
Minimum |
Disaggregation of Revenue [Line Items] |
Termination period | 3 months
Maximum |
Disaggregation of Revenue [Line Items] |
Termination period | 12 months

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- Definition Revenue, Performance Obligation, Notice Of Termination, Period + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130554-203045 + Details
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