Employee Benefit Plans - Reconciliation of Changes in Fair Value of Plan Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-US
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 68,597,000	$ 77,141,000
Actual return on plan assets	8,282,000	(1,366,000)
Employer contributions	0	0	$ 700,000
Benefits paid	(2,821,000)	(3,282,000)
Settlement and curtailment	0	0
Foreign exchange rate changes	2,371,000	(3,896,000)
Fair value of plan assets at end of year	76,429,000	68,597,000	77,141,000
US plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	165,730,000	189,240,000
Actual return on plan assets	35,597,000	(16,326,000)
Employer contributions	1,317,000	4,553,000	2,300,000
Benefits paid	(7,201,000)	(7,218,000)
Settlement and curtailment	(1,283,000)	(4,519,000)
Foreign exchange rate changes	0	0
Fair value of plan assets at end of year	$ 194,160,000	$ 165,730,000	$ 189,240,000