Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined benefit plans:
Multiemployer pension plans	$ 379	$ 483	$ 788	$ 1,004
Defined contribution pension plans	1,897	2,969	5,066	6,359
Pension Plan | U.S. Plans
Defined benefit plans:
Service cost	0	10	0	20
Interest cost	1,845	2,651	3,690	5,302
Expected return on plan assets	(2,842)	(2,593)	(5,684)	(5,186)
Recognized prior service costs	0	0	0	0
Recognized loss	1,225	1,405	2,650	2,810
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	129	0	129
Defined benefit pension plans net periodic pension cost (benefit)	228	1,602	656	3,075
Defined benefit pension plan	460	2,011	2,487	3,490
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	5,700		5,700
Pension Plan | International Plans
Defined benefit plans:
Service cost	426	357	855	713
Interest cost	4,235	5,548	8,630	11,212
Expected return on plan assets	(9,833)	(9,319)	(20,023)	(18,836)
Recognized prior service costs	106	65	213	131
Recognized loss	3,532	3,577	7,187	7,230
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		0	0
Defined benefit pension plans net periodic pension cost (benefit)	(1,534)	228	(3,138)	450
Defined benefit pension plan	1,493	$ 3,131	11,553	$ 12,401
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 8,400		$ 8,400