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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Services	$ 379,743	$ 390,532	$ 706,711	$ 735,232
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	9,728		31,004
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	389,471		737,715
United States
Disaggregation of Revenue [Line Items]
Services	295,268	304,463	551,792	579,145
United States | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	6,023		15,041
United States | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	301,291		566,833
Canada
Disaggregation of Revenue [Line Items]
Services	33,086	30,583	59,465	57,053
Canada | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	(3,591)		(2,638)
Canada | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	29,495		56,827
Other
Disaggregation of Revenue [Line Items]
Services	51,389	55,486	95,454	99,034
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	7,296		18,601
Other | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	58,685		114,055
Food & Beverage
Disaggregation of Revenue [Line Items]
Services	84,464	79,299	147,932	140,590
Food & Beverage | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	(940)		5,866
Food & Beverage | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	83,524		153,798
Retail
Disaggregation of Revenue [Line Items]
Services	38,396	46,357	76,411	91,791
Retail | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	1,343		1,772
Retail | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	39,739		78,183
Consumer Products
Disaggregation of Revenue [Line Items]
Services	41,367	40,668	77,973	75,729
Consumer Products | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	(1,048)		(774)
Consumer Products | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	40,319		77,199
Communications
Disaggregation of Revenue [Line Items]
Services	43,097	55,740	81,454	104,055
Communications | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	5,699		12,182
Communications | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	48,796		93,636
Automotive
Disaggregation of Revenue [Line Items]
Services	25,294	33,806	45,788	66,285
Automotive | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	1,856		6,074
Automotive | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	27,150		51,862
Technology
Disaggregation of Revenue [Line Items]
Services	23,540	26,324	45,080	46,872
Technology | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	(141)		(310)
Technology | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	23,399		44,770
Healthcare
Disaggregation of Revenue [Line Items]
Services	35,426	32,271	68,002	61,199
Healthcare | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	(612)		519
Healthcare | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	34,814		68,521
Financials
Disaggregation of Revenue [Line Items]
Services	30,207	26,808	52,702	47,146
Financials | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	710		911
Financials | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	30,917		53,613
Transportation and Travel/Lodging
Disaggregation of Revenue [Line Items]
Services	18,776	13,665	33,664	27,775
Transportation and Travel/Lodging | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	42		776
Transportation and Travel/Lodging | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	18,818		34,440
Other
Disaggregation of Revenue [Line Items]
Services	39,176	$ 35,594	77,705	$ 73,790
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Services	2,819		3,988
Other | Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Services	$ 41,995		$ 81,693

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ 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 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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