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Business segment information (revenue by product and service) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue by product and service category                      
Total revenue $ 480,202 $ 458,920 $ 450,642 $ 459,298 $ 463,510 $ 439,816 $ 435,874 $ 433,617 $ 1,849,062 $ 1,772,817 $ 1,674,082
Checks [Member]                      
Revenue by product and service category                      
Total revenue                 865,285 873,298 870,910
Marketing solutions and other services [Member]                      
Revenue by product and service category                      
Total revenue                 616,917 532,465 427,098
Forms [Member]                      
Revenue by product and service category                      
Total revenue                 215,784 215,663 216,842
Accessories and other products [Member]                      
Revenue by product and service category                      
Total revenue                 $ 151,076 $ 151,391 $ 159,232