Revenue Recognition - Contract Acquisition Costs Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Capitalized Contract Cost [Line Items]
Amortization expense related to contract acquisition costs	$ 75,429	$ 72,412
Contract Acquisition Costs
Capitalized Contract Cost [Line Items]
Amortization expense related to contract acquisition costs	$ 25,700	$ 24,700

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

Name:	us-gaap_CapitalizedContractCostAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration