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Basis of Presentation - Reclassifications to Previously Reported Amounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative expenses	$ 35,411	$ 32,096
As previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative expenses		38,730
Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative expenses		(6,634)
Services
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues	83,239	70,962
Services | As previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		63,210
Services | Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		7,752
Products
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues	$ 20,128	17,629
Products | As previously reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		18,747
Products | Reclassifications
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		$ (1,118)

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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