Employee Retirement and Pension Benefits - Amount Reported in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S.
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Before Tax [Roll Forward]
Net actuarial pension loss beginning of period	$ 96,090	$ 112,632	$ 127,982
Actuarial loss	8,919	9,314	12,680
Net loss (gain) occurring during year	288	(7,228)	(2,670)
Net actuarial pension loss at end of period	96,090	112,632	127,982	$ 87,459	$ 96,090	$ 112,632
Tax benefit				(3,145)	(5,344)	(9,583)
Net actuarial pension loss at end of period, net of tax				84,314	90,746	103,049
Non U.S
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Before Tax [Roll Forward]
Net actuarial pension loss beginning of period	7,450	7,359	6,781
Actuarial loss	(553)	(1,442)	(149)
Net loss (gain) occurring during year	5,232	1,462	742
Cumulative translation adjustment	108	71	(15)
Net actuarial pension loss at end of period	$ 7,450	$ 7,359	$ 6,781	12,237	7,450	7,359
Tax benefit				(2,958)	(1,911)	(1,886)
Net actuarial pension loss at end of period, net of tax				$ 9,279	$ 5,539	$ 5,473