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Revenue Recognition (Disaggregation of Recurring Revenue by Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 229,440	$ 231,991	$ 448,631	$ 455,612
Contractual recurring [Member]
Disaggregation of Revenue [Line Items]
Revenue	151,150	148,214	297,971	295,958
Transactional recurring [Member]
Disaggregation of Revenue [Line Items]
Revenue	65,836	68,046	125,765	125,169
Recurring [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 216,986	$ 216,260	$ 423,736	$ 421,127

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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