Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 51,414	$ 63,588	$ 165,250	$ 214,417
Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	6,562		19,200
Contact Centers
Disaggregation of Revenue [Line Items]
Total Revenues	14,618		$ 46,688
Contract period			six months to one year
Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	6,442		$ 19,282
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	23,792		$ 80,080
Revenue for performance obligations recognized over time
Disaggregation of Revenue [Line Items]
Total Revenues	46,951		150,079
Revenue for performance obligations recognized over time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	6,286		18,793
Revenue for performance obligations recognized over time | Contact Centers
Disaggregation of Revenue [Line Items]
Total Revenues	14,618		46,688
Revenue for performance obligations recognized over time | Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	5,272		16,745
Revenue for performance obligations recognized over time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total Revenues	20,775		67,853
Revenue for performance obligations recognized at a point in time
Disaggregation of Revenue [Line Items]
Total Revenues	4,463		15,171
Revenue for performance obligations recognized at a point in time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total Revenues	276		407
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	1,170		2,537
Revenue for performance obligations recognized at a point in time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total Revenues	3,017		12,227
B2B
Disaggregation of Revenue [Line Items]
Total Revenues	11,290	14,069	35,149	47,673
Consumer Brands
Disaggregation of Revenue [Line Items]
Total Revenues	11,171	12,642	35,222	47,893
Financial Services
Disaggregation of Revenue [Line Items]
Total Revenues	11,635	13,185	36,850	42,185
Healthcare
Disaggregation of Revenue [Line Items]
Total Revenues	5,257	4,382	14,946	12,800
Retail
Disaggregation of Revenue [Line Items]
Total Revenues	8,803	14,933	31,752	46,884
Transportation
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3,258	$ 4,377	$ 11,331	$ 16,982