Segment Information - Revenue by segment information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Segment information
Number of segments \| segment	3
Revenue	$ 403,765	$ 393,167
Cost of revenue	306,882	293,792
Selling, general and administrative expenses	49,949	45,595
Depreciation and amortization	28,020	38,019
Related party expense	994	1,105
Interest expense, net	38,899	38,017
Sundry expense (income), net	2,531	(64)
Other income, net	1,677	(3,328)
Net loss before income taxes	(25,187)	(19,969)
ITPS
Segment information
Revenue	324,580	311,937
Cost of revenue	257,388	245,173
HS
Segment information
Revenue	61,343	58,632
Cost of revenue	38,506	34,956
LLPS
Segment information
Revenue	17,842	22,598
Cost of revenue	$ 10,988	$ 13,663

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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