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Supplemental balance sheet and cash flow information (intangibles) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Amortizable intangibles [Line Items]          
Gross carrying amount $ 878,948   $ 878,948   $ 895,592
Accumulated amortization (591,450)   (591,450)   (535,627)
Net carrying amount 287,498   287,498   359,965
Amortization of intangibles 26,736 $ 28,505 83,224 $ 84,199  
Estimated future amortization expense          
Remainder of 2019 27,463   27,463    
2020 89,907   89,907    
2021 68,423   68,423    
2022 41,251   41,251    
2023 26,533   26,533    
Asset purchase [Member]          
Amortizable intangibles [Line Items]          
Acquired intangibles     $ 45,340    
Acquired intangibles, weighted-average amortization period (in years)     5 years    
Internal-use software [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 417,098   $ 417,098   388,477
Accumulated amortization (334,336)   (334,336)   (308,313)
Net carrying amount 82,762   82,762   80,164
Internal-use software [Member] | Asset purchase [Member]          
Amortizable intangibles [Line Items]          
Acquired intangibles     $ 33,370    
Acquired intangibles, weighted-average amortization period (in years)     3 years    
Customer lists/relationships [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 357,809   $ 357,809   379,570
Accumulated amortization (190,993)   (190,993)   (170,973)
Net carrying amount 166,816   166,816   208,597
Customer lists/relationships [Member] | Asset purchase [Member]          
Amortizable intangibles [Line Items]          
Acquired intangibles [1]     $ 11,970    
Acquired intangibles, weighted-average amortization period (in years) [1]     8 years    
Trade names [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 32,361   $ 32,361   50,645
Accumulated amortization (27,048)   (27,048)   (26,204)
Net carrying amount 5,313   5,313   24,441
Technology-based intangibles [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 34,080   34,080   39,300
Accumulated amortization (19,772)   (19,772)   (14,007)
Net carrying amount 14,308   14,308   25,293
Software to be sold [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 36,900   36,900   36,900
Accumulated amortization (18,601)   (18,601)   (15,430)
Net carrying amount 18,299   18,299   21,470
Other [Member]          
Amortizable intangibles [Line Items]          
Gross carrying amount 700   700   700
Accumulated amortization (700)   (700)   (700)
Net carrying amount $ 0   $ 0   $ 0
[1] These asset purchases did not qualify as business combinations.