SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (assets held for sale) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) disposal_groups
Assets held for sale [Line Items]
Proceeds from sales of businesses - notes receivable \| $	$ 1,612	$ 1,685	$ 35,616
(Loss) gain on sales of businesses and customer lists \| $	$ (1,846)	$ (124)	$ 15,641
Assets held for sale [Member] \| Providers of printed and promotional products [Member]
Assets held for sale [Line Items]
Number of businesses sold \| disposal_groups			2
Assets held for sale [Member] \| Small business distributors [Member]
Assets held for sale [Line Items]
Number of businesses sold \| disposal_groups			2

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586

Name:	us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration