Debt - Narrative (Details)			1 Months Ended	3 Months Ended			6 Months Ended
	Jul. 27, 2020 USD ($)	Jul. 31, 2015 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jul. 31, 2020 EUR (€)	May 31, 2020 EUR (€)	Mar. 31, 2020 EUR (€)
Credit facility
Interest rate				7.25%			7.25%
Amortization of deferred financing costs							$ 1,266,000	$ 1,163,000
Long term debt, gross				$ 265,728,000			265,728,000
Interest rate swap
Credit facility
Cash flow hedge, gain (loss)			$ 4,000,000.0
Derivative financial instruments, liabilities | Interest rate swap
Credit facility
Unrealized gain (loss)						$ 300,000		(700,000)
Maximum
Credit facility
Commitment fee percentage	0.50%
Minimum
Credit facility
Commitment fee percentage	0.375%
Eurodollar
Credit facility
Margin of interest (as a percent)	6.25%
Eurodollar | Maximum
Credit facility
Margin of interest (as a percent)	6.25%
Eurodollar | Minimum
Credit facility
Margin of interest (as a percent)	6.00%
Base rate
Credit facility
Margin of interest (as a percent)	5.25%
Revolving loan
Credit facility
Maximum borrowing available	$ 25,000,000.0
Debt issuance costs incurred	500,000	$ 1,300,000
Long term debt, gross				0			0
Term loan
Credit facility
Face amount	275,000,000.0	425,000,000.0		263,900,000			263,900,000			€ 600,000	€ 300,000	€ 1,000,000.0
Interest rate										2.50%	2.20%	1.50%
Prepayment of principal					$ 9,100,000
Extinguishment of debt	107,100,000
Loan balance	403,800,000			263,876,000			263,876,000		$ 274,313,000
Modification of debt	296,700,000
Write off of deferred debt issuance cost	700,000
Unamortized issuance costs	1,900,000
Debt issuance costs incurred	7,500,000	$ 12,900,000
Amortization of deferred financing costs						$ 600,000	300,000	$ 1,200,000
Deferred issuance costs, net				7,387,000			7,387,000		$ 8,588,000
Long term debt, gross				0			0
Fair value of debt				264,900,000			264,900,000
Amortization per year (as a percent)		1.00%
Term loan | Amended Credit Facility
Credit facility
Debt issuance costs incurred	6,400,000
Amortization of deferred financing costs				$ 500,000			$ 900,000
Term loan | Existing lenders
Credit facility
Write off of deferred debt issuance cost	4,400,000
Term loan | New lenders
Credit facility
Debt issuance costs incurred	1,100,000
Bridge loan
Credit facility
Maximum borrowing available	5,000,000.0
Letter-of-credit sub-facility
Credit facility
Maximum borrowing available	$ 10,000,000.0	$ 10,000,000.0
Credit facility | Alternate base rate
Credit facility
Margin of interest (as a percent)		3.75%
Credit facility | LIBOR
Credit facility
Margin of interest (as a percent)		4.75%
Variable rate base minimum (as a percent)		1.00%