Segment and Geographic Information - Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 498,362	$ 452,459	$ 446,014	$ 467,604	$ 481,208	$ 429,878	$ 419,972	$ 449,800	$ 1,864,439	$ 1,780,858	$ 1,779,822
Long-Lived Assets	347,673				300,883				347,673	300,883	284,386
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,193,513	1,224,135	1,292,492
Long-Lived Assets	254,395				226,358				254,395	226,358	227,659
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									641,505	531,744	464,161
Long-Lived Assets	80,385				65,260				80,385	65,260	53,175
Other Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									29,421	24,979	23,169
Long-Lived Assets	$ 12,893				$ 9,265				$ 12,893	$ 9,265	$ 3,552