Revenue from Contracts with Customers (Details 1) - 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
Disaggregation of Revenue [Line Items]
Total revenue	$ 70,209	$ 63,588	$ 69,633	$ 81,198	$ 99,866	$ 94,424	$ 94,722	$ 94,894	$ 284,628	$ 383,906
Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total revenue									35,759
Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total revenue									$ 35,210
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 revenue									$ 135,361
Contact Centers
Disaggregation of Revenue [Line Items]
Total revenue									78,298
Revenue for performance obligations recognized over time
Disaggregation of Revenue [Line Items]
Total revenue									272,975
Revenue for performance obligations recognized over time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total revenue									34,621
Revenue for performance obligations recognized over time | Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total revenue									31,684
Revenue for performance obligations recognized over time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total revenue									128,372
Revenue for performance obligations recognized over time | Contact Centers
Disaggregation of Revenue [Line Items]
Total revenue									78,298
Revenue for performance obligations recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue									11,653
Revenue for performance obligations recognized at a point in time | Agency & Digital Services
Disaggregation of Revenue [Line Items]
Total revenue									1,138
Revenue for performance obligations recognized at a point in time | Database Marketing Solutions
Disaggregation of Revenue [Line Items]
Total revenue									3,526
Revenue for performance obligations recognized at a point in time | Direct Mail, Logistics, and Fulfillment
Disaggregation of Revenue [Line Items]
Total revenue									6,989
Revenue for performance obligations recognized at a point in time | Contact Centers
Disaggregation of Revenue [Line Items]
Total revenue									0
B2B
Disaggregation of Revenue [Line Items]
Total revenue									64,026
Consumer Brands
Disaggregation of Revenue [Line Items]
Total revenue									58,382
Financial Services
Disaggregation of Revenue [Line Items]
Total revenue									53,919
Healthcare
Disaggregation of Revenue [Line Items]
Total revenue									19,931
Retail
Disaggregation of Revenue [Line Items]
Total revenue									66,545
Transportation
Disaggregation of Revenue [Line Items]
Total revenue									$ 21,825