Employee Benefit Plans (Details) - Pension Plan - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. Plans
Defined Contribution Plan [Abstract]
Discretionary contributions	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	39,000	42,000	43,000
Interest cost	10,551,000	9,562,000	9,878,000
Expected return on plan assets	(10,297,000)	(12,068,000)	(10,485,000)
Recognized prior service costs	0	1,000	33,000
Recognized losses	5,585,000	5,207,000	5,701,000
Settlement/curtailment loss (gain)	129,000	285,000	0
Defined benefit plans pension cost	6,007,000	3,029,000	5,170,000
Defined contribution plans	4,178,000	3,466,000	3,021,000
Net periodic pension cost, U.S. Plans	$ 10,912,000	7,181,000	8,841,000
U.S. Plans | Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	4.00%
U.S. Plans | Multiemployer Plans, Pension, Domestic [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Multiemployer plans	$ 727,000	686,000	650,000
International Plans
Defined Contribution Plan [Abstract]
Additional contribution towards insurance and administrative costs (as a percent)	2.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1,447,000	1,669,000	1,724,000
Interest cost	22,280,000	21,589,000	21,459,000
Expected return on plan assets	(37,430,000)	(42,685,000)	(40,469,000)
Recognized prior service costs	326,000	(140,000)	186,000
Recognized losses	14,345,000	14,807,000	16,283,000
Settlement/curtailment loss (gain)	19,000	(36,000)	(20,000)
Defined benefit plans pension cost	987,000	(4,796,000)	(837,000)
Defined contribution plans	6,031,000	5,608,000	5,905,000
Net periodic pension cost, International Plans	$ 8,185,000	2,125,000	6,374,000
International Plans | Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	6.00%
International Plans | Multiemployer Plans, Pension, Domestic [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Multiemployer plans	$ 1,167,000	$ 1,313,000	$ 1,306,000