Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 54,686	$ 69,633	$ 113,836	$ 150,829
Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	6,406		12,638
Contact Centers
Disaggregation of Revenue [Line Items]
Total Revenues	16,332		$ 32,070
Contract period			six months to one year
Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	5,947		$ 12,839
Contract period			four to five years
Database Marketing Solutions | Short-term Contract
Disaggregation of Revenue [Line Items]
Contract period			less than two months
Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total Revenues	26,001		$ 56,289
Revenue for performance obligations recognized over time
Disaggregation of Revenue [Line Items]
Total Revenues	50,353		103,128
Revenue for performance obligations recognized over time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	6,314		12,507
Revenue for performance obligations recognized over time | Contact Centers
Disaggregation of Revenue [Line Items]
Total Revenues	16,332		32,070
Revenue for performance obligations recognized over time | Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	5,367		11,473
Revenue for performance obligations recognized over time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total Revenues	22,340		47,078
Revenue for performance obligations recognized at a point in time
Disaggregation of Revenue [Line Items]
Total Revenues	4,333		10,708
Revenue for performance obligations recognized at a point in time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	92		131
Revenue for performance obligations recognized at a point in time | Contact Centers
Disaggregation of Revenue [Line Items]
Total Revenues	0		0
Revenue for performance obligations recognized at a point in time | Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	580		1,366
Revenue for performance obligations recognized at a point in time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total Revenues	3,661		9,211
B2B
Disaggregation of Revenue [Line Items]
Total Revenues	11,074	14,800	23,859	33,483
Consumer Brands
Disaggregation of Revenue [Line Items]
Total Revenues	11,888	15,828	24,051	35,171
Financial Services
Disaggregation of Revenue [Line Items]
Total Revenues	12,250	14,441	25,215	28,922
Healthcare
Disaggregation of Revenue [Line Items]
Total Revenues	5,061	4,083	9,689	8,461
Retail
Disaggregation of Revenue [Line Items]
Total Revenues	10,639	15,836	22,949	32,215
Transportation
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3,774	$ 4,645	$ 8,073	$ 12,577