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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue	$ 700
Deferred expense	300							$ 400
Decrease to retained earnings	$ (89,502)	$ (84,728)	$ (83,421)	$ (77,338)	$ (74,738)	$ (75,554)	$ (72,360)		$ (71,453)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue								700
Decrease to retained earnings								$ 300

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