Goodwill and Intangible Assets, Net, Intangible Assets, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	$ 54,827	$ 54,537	$ 61,972
Accumulated amortization	(26,525)	(25,211)	(30,259)
Net carrying amount	28,302	29,326	31,713
North America
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	30,715	30,775	33,862
Accumulated amortization	(14,472)	(13,732)	(14,815)
Net carrying amount	16,243	17,043	19,047
Europe
Changes in gross carrying amount of finite-lived intangible assets
Gross carrying amount	24,112	23,762	28,110
Accumulated amortization	(12,053)	(11,479)	(15,444)
Net carrying amount	$ 12,059	$ 12,283	$ 12,666