Retirement Plans - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) plan
Defined Benefit Plan Disclosure
Defined contribution plan number	6
United States
Defined Benefit Plan Disclosure
Number of retirement plans	3
Number of defined benefit plans	1
Defined contribution plan number	2
Defined benefit plan, contributions by employer | $	$ 300
Defined benefit plan, expected future employer contributions, current fiscal year | $	$ 660
Canada
Defined Benefit Plan Disclosure
Defined contribution plan number	2
Number of post-retirement benefit plan	1
United Kingdom
Defined Benefit Plan Disclosure
Defined contribution plan number	2
Defined benefit plan, contributions by employer | $	$ 231
Defined benefit plans, estimated future employer contributions in current fiscal year | $	$ 309