Goodwill and Intangible Assets, Net, Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,400	$ 1,400	$ 4,065	$ 4,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years 2 months 12 days
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	54,656	54,650	$ 54,656	54,650	$ 53,178
Accumulated amortization	(32,840)	(29,193)	(32,840)	(29,193)	(28,776)
Net carrying amount	21,816	25,457	21,816	25,457	24,402
North America
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	31,305	30,715	31,305	30,715	30,825
Accumulated amortization	(18,461)	(15,993)	(18,461)	(15,993)	(16,002)
Net carrying amount	12,844	14,722	12,844	14,722	14,823
Europe
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	23,351	23,935	23,351	23,935	22,353
Accumulated amortization	(14,379)	(13,200)	(14,379)	(13,200)	(12,774)
Net carrying amount	$ 8,972	$ 10,735	$ 8,972	$ 10,735	$ 9,579