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Revenue from Contracts with Customers - Contract Acquisition Costs and Cost to Fulfill Contracts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Capitalized Contract Cost [Roll Forward]
Beginning Balance	$ 10,476	$ 9,755	$ 10,091	$ 9,841
Contract payments	1,840	1,613	4,996	4,246
Contract amortization	(1,399)	(1,339)	(4,170)	(4,058)
Ending Balance	$ 10,917	$ 10,029	$ 10,917	$ 10,029

X

- Definition

Capitalized Contract Cost, Payments

+ References

No definition available.

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X

- Definition

Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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