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Supplemental balance sheet information (assets held for sale) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
disposal_groups
Mar. 31, 2018
disposal_groups
Sep. 30, 2017
USD ($)
disposal_groups
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
disposal_groups
Sep. 30, 2017
USD ($)
disposal_groups
Dec. 31, 2017
USD ($)
disposal_groups
Assets held for sale [Line Items]                
Consideration received for sales of businesses $ 28,028         $ 28,028    
Net gain on sales of assets 1,765   $ 1,924     12,855 $ 8,703  
Small business distributors [Member]                
Assets held for sale [Line Items]                
Number of businesses sold | disposal_groups     2       3  
Non-recurring fair value measurement [Member]                
Assets held for sale [Line Items]                
Asset impairment charges       $ 2,954 $ 5,296   $ 8,250  
Assets held for sale [Member]                
Assets held for sale [Line Items]                
Current assets 0         0   $ 4
Intangibles 3,250         3,250   8,459
Goodwill 0         0   3,566
Other non-current assets 0         0   207
Net assets held for sale $ 3,250         $ 3,250   $ 12,236
Assets held for sale [Member] | Providers of printed and promotional products [Member]                
Assets held for sale [Line Items]                
Number of disposal groups held for sale | disposal_groups               2
Number of businesses sold | disposal_groups           2 1  
Assets held for sale [Member] | Small business distributors [Member]                
Assets held for sale [Line Items]                
Number of disposal groups held for sale | disposal_groups 1         1   2
Number of businesses sold | disposal_groups   1            
Assets held for sale [Member] | Customer lists/relationships [Member]                
Assets held for sale [Line Items]                
Number of disposal groups held for sale | disposal_groups 3         3