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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services | $ 393,662 | $ 375,830 | $ 379,743 | $ 326,968 | $ 402,747 | $ 375,800 | $ 390,532 | $ 344,700 | $ 1,476,203 | $ 1,513,779 | $ 1,385,785
United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 1,153,192 | 1,172,364 | 1,103,714
Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 124,000 | 123,092 | 124,101
Other Geographical Location [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 199,011 | 218,323 | 157,970
Food & Beverage [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 313,368 | 313,786 | 266,600
Retail [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 152,552 | 178,152 | 182,428
Consumer Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 162,524 | 162,307 | 147,849
Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 178,410 | 208,701 | 160,064
Automotive [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 88,807 | 127,023 | 129,352
Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 104,479 | 99,325 | 109,309
Health Care [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 127,547 | 124,261 | 115,159
Financials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 110,069 | 104,713 | 85,480
Transportation and Travel/Lodging [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 86,419 | 56,955 | 58,298
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 152,028 | $ 138,556 | $ 131,246
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 51,636 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 20,699 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | (1,288) |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Other Geographical Location [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 32,225 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Food & Beverage [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 7,064 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | (2,683) |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Consumer Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 585 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 25,957 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Automotive [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 8,587 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 38 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Health Care [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 507 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Financials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 146 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Transportation and Travel/Lodging [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 2,461 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 8,974 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 1,527,839 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | United States |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 1,173,891 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Canada |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 122,712 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other Geographical Location [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 231,236 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Food & Beverage [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 320,432 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Retail [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 149,869 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Consumer Products [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 163,109 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Communications [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 204,367 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Automotive [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 97,394 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 104,517 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Health Care [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 128,054 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Financials [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 110,215 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Transportation and Travel/Lodging [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | 88,880 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Services |  |  |  |  |  |  |  |  | $ 161,002 |  |

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