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Basis of Presentation and Significant Accounting Policies - Reclassifications to Previously Reported Amounts (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cost of revenues, exclusive of depreciation and amortization
Services	$ 55,501	$ 55,317	$ 51,683	$ 107,000	$ 162,501	$ 223,222	$ 246,652	$ 384,842
Products	16,230	23,027	22,269	45,296	61,526	87,200	70,616	129,748
General and administrative expenses						$ 163,704	171,887	174,479
As previously reported
Cost of revenues, exclusive of depreciation and amortization
Services	60,981	60,777	57,107	117,884	178,865		201,316	304,473
Products	$ 10,750	$ 17,567	$ 16,845	$ 34,412	$ 45,162		59,037	113,918
General and administrative expenses							228,802	270,678
Reclassifications
Cost of revenues, exclusive of depreciation and amortization
Services							45,336	80,369
Products							11,579	15,830
General and administrative expenses							$ (56,915)	$ (96,199)

X

- Definition

Total costs related to goods produced and sold during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Total costs related to services rendered by an entity during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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