Goodwill, Finite-Lived, and Indefinite-Lived Intangibles Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 118,534		$ 118,534		$ 121,575
Finite-lived intangible assets, accumulated amortization	(77,974)		(77,974)		(74,620)
Finite-lived intangible assets, net	40,560		40,560		46,955
Amortization of Acquired Intangible Assets	2,200	$ 2,200	4,700	$ 5,200
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	81,117		81,117		83,012
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	19,578		19,578		19,979
Dealer Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	6,450		6,450		6,726
Airport Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	4,387		4,387		4,635
Store Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	2,367		2,367		2,500
Brand [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	869		869		918
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	2,662		2,662		2,689
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	752		752		764
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	140		140		140
Database [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	212		212		212
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 42,055		$ 42,055		$ 42,055