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Quarterly Financial Data (Unaudited) - Blackhawk Reclassifications (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
Business Acquisition [Line Items]
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
As previously reported
Business Acquisition [Line Items]
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
Blackhawk | Blackhawk adjustment
Business Acquisition [Line Items]
Services	(5,480)	(5,460)	(5,424)	(10,884)	(16,364)
Products	$ 5,480	$ 5,460	$ 5,424	$ 10,884	$ 16,364

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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