Revenue Recognition (Extended Warranties and Post-Contract Support) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 106,283	$ 106,283		$ 110,158
Up-front customer loyalty programs and volume commitment programs
Disaggregation of Revenue [Line Items]
Deferred revenue	975,000	$ 975,000
Deferred revenue, expected recognition within remainder of year, percentage		15.00%
Deferred revenue, expected recognition during year two, percentage		25.00%
Deferred revenue, expected recognition during year three, percentage		20.00%
Deferred revenue, expected recognition thereafter, percentage		40.00%
Extended warranties and post contract support
Disaggregation of Revenue [Line Items]
Post-contract support contract, term		12 months
Extended warranties and post contract support | Accounting Standards Update 2014-09
Disaggregation of Revenue [Line Items]
Deferred revenue	41,600	$ 41,600	$ 40,300
Deferred revenue, revenue recognized	2,300	$ 14,100
Deferred revenue, term		1 year
Deferred revenue, with an original duration of more than one year		$ 29,000
Deferred revenue, expected recognition within remainder of year, percentage		13.00%
Deferred revenue, expected recognition during year two, percentage		29.00%
Deferred revenue, expected recognition during year three, percentage		24.00%
Deferred revenue, expected recognition thereafter, percentage		34.00%
Instrument rebate programs
Disaggregation of Revenue [Line Items]
Deferred revenue	60,700	$ 60,700	$ 65,900
Deferred revenue, revenue recognized	4,600	$ 9,200
Deferred revenue, expected recognition within remainder of year, percentage		15.00%
Deferred revenue, expected recognition during year two, percentage		28.00%
Deferred revenue, expected recognition during year three, percentage		22.00%
Deferred revenue, expected recognition thereafter, percentage		35.00%
Reagent rental programs
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 92,000	$ 92,000
Deferred revenue, expected recognition within remainder of year, percentage		17.00%
Deferred revenue, expected recognition during year two, percentage		31.00%
Deferred revenue, expected recognition during year three, percentage		25.00%
Deferred revenue, expected recognition thereafter, percentage		27.00%
Minimum | Extended warranties and post contract support
Disaggregation of Revenue [Line Items]
Extended product warranty, term		1 year
Maximum | Extended warranties and post contract support
Disaggregation of Revenue [Line Items]
Extended product warranty, term		5 years