Information by Segment and Geographic Area (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	$ 1,607,062	$ 1,451,223	$ 1,723,092
Property, plant and equipment, net	479,747	490,255	564,035
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	697,663	614,327	758,820
Property, plant and equipment, net	120,555	125,386	142,506
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	146,624	156,552	217,011
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	95,569	90,288	97,305
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	54,704	62,597	57,381
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from Unaffiliated Customers	762,775	680,344	747,261
Property, plant and equipment, net	$ 208,919	$ 211,984	$ 266,843