Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined benefit plans:
Multiemployer pension plans	$ 390	$ 527	$ 1,178	$ 1,531
Defined contribution pension plans	2,870	2,358	7,936	8,717
Pension Plan | U.S. Plans
Defined benefit plans:
Service cost	0	10	0	30
Interest cost	1,845	2,637	5,535	7,939
Expected return on plan assets	(2,842)	(2,602)	(8,526)	(7,788)
Recognized prior service costs	0	0	0	0
Recognized loss	1,225	1,395	3,875	4,205
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	0	0	129
Defined benefit pension plans net periodic pension cost (benefit)	228	1,440	884	4,515
Defined benefit pension plan	453	2,806	2,940	6,296
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	3,100		3,100
Pension Plan | International Plans
Defined benefit plans:
Service cost	448	344	1,303	1,057
Interest cost	4,474	5,168	13,104	16,380
Expected return on plan assets	(10,405)	(8,671)	(30,428)	(27,507)
Recognized prior service costs	113	61	326	192
Recognized loss	3,737	3,326	10,924	10,556
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		0	0	0
Defined benefit pension plans net periodic pension cost (benefit)	(1,633)	228	(4,771)	678
Defined benefit pension plan	2,682	$ 4,121	14,235	$ 16,522
Anticipated contributions to defined benefit pension plans during the remainder of the fiscal year	$ 6,100		$ 6,100