Retirement Plans - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 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 | $	$ 500
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 | $	$ 85
Defined benefit plan, expected future employer contributions, current fiscal year | $	$ 340