Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined benefit plans:
Multiemployer pension plans	$ 521	$ 501
Defined contribution pension plans	3,390	2,835
Pension Plan | U.S. Plans
Defined benefit plans:
Service cost	10	10
Interest cost	2,651	2,391
Expected return on plan assets	(2,593)	(3,017)
Recognized prior service costs	0	0
Recognized loss	1,405	1,302
Settlement/curtailment losses	0	(166)
Defined benefit pension plans net periodic pension cost (benefit)	1,473	852
Defined benefit pension plan	1,479	1,284
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	7,000
Pension Plan | International Plans
Defined benefit plans:
Service cost	356	386
Interest cost	5,664	5,672
Expected return on plan assets	(9,517)	(11,145)
Recognized prior service costs	66	(39)
Recognized loss	3,653	3,840
Settlement/curtailment losses	0	0
Defined benefit pension plans net periodic pension cost (benefit)	222	(1,286)
Defined benefit pension plan	9,270	$ 9,734
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 11,500