Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Industry Vertical [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

The following table presents revenue disaggregated by client industry vertical for the twelve months ended December 31, 2018, 2017, and 2016 and the impact of adoption of ASC 606:

		Twelve Months Ended December 31,
		2018							2017		2016
Industry	Reportable Segment	As reported		Adjustment to exclude impact of Adoption of ASC 606			Adjusted
Food & Beverage	All	$	313,368	$	7,064		$	320,432	$	313,786	$	266,600
Retail	All	152,552		(2,683		)	149,869		178,152		182,428
Consumer Products	All	162,524		585			163,109		162,307		147,849
Communications	All	178,410		25,957			204,367		208,701		160,064
Automotive	All	88,807		8,587			97,394		127,023		129,352
Technology	All	104,479		38			104,517		99,325		109,309
Healthcare	All	127,547		507			128,054		124,261		115,159
Financials	All	110,069		146			110,215		104,713		85,480
Transportation and Travel/Lodging	All	86,419		2,461			88,880		56,955		58,298
Other	All	152,028		8,974			161,002		138,556		131,246
		$	1,476,203	$	51,636		$	1,527,839	$	1,513,779	$	1,385,785

By Location [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

The following table presents revenue disaggregated by geography for the twelve months ended December 31, 2018, 2017, and 2016 and the impact of adoption of ASC 606:

		Twelve Months Ended December 31,
		2018							2017		2016
Geographic Location	Reportable Segment	As reported		Adjustment to exclude impact of Adoption of ASC 606			Adjusted
United States	All	$	1,153,192	$	20,699		$	1,173,891	$	1,172,364	$	1,103,714
Canada	All	124,000		(1,288		)	122,712		123,092		124,101
Other	All, Excluding Domestic Creative Agencies	199,011		32,225			231,236		218,323		157,970
		$	1,476,203	$	51,636		$	1,527,839	$	1,513,779	$	1,385,785