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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Amortizable intangibles [Line Items]      
Gross carrying amount $ 795,753   $ 833,145
Accumulated amortization (555,739)   (557,023)
Net carrying amount 240,014   276,122
Amortization of intangibles 23,511 $ 28,174  
Estimated future amortization expense      
Remainder of 2020 65,994    
2021 74,042    
2022 50,325    
2023 31,879    
2024 15,013    
Internal-use software [Member]      
Amortizable intangibles [Line Items]      
Gross carrying amount 387,356   380,905
Accumulated amortization (312,444)   (299,698)
Net carrying amount 74,912   81,207
Acquired intangibles $ 10,146    
Acquired intangibles, weighted-average amortization period (in years) 3 years    
Customer lists/relationships [Member]      
Amortizable intangibles [Line Items]      
Gross carrying amount $ 307,372   348,055
Accumulated amortization (170,776)   (187,462)
Net carrying amount 136,596   160,593
Software to be sold [Member]      
Amortizable intangibles [Line Items]      
Gross carrying amount 36,900   36,900
Accumulated amortization (20,714)   (19,657)
Net carrying amount 16,186   17,243
Technology-based intangibles [Member]      
Amortizable intangibles [Line Items]      
Gross carrying amount 34,613   34,780
Accumulated amortization (23,763)   (22,122)
Net carrying amount 10,850   12,658
Trade names [Member]      
Amortizable intangibles [Line Items]      
Gross carrying amount 29,512   32,505
Accumulated amortization (28,042)   (28,084)
Net carrying amount $ 1,470   $ 4,421