Financing Arrangements and Fair Value of Financial Instruments - Narrative (Details)	1 Months Ended				3 Months Ended		6 Months Ended
	May 31, 2022 USD ($)	Apr. 30, 2022 GBP (£)	Dec. 31, 2021 USD ($)	Aug. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 GBP (£)	Feb. 28, 2021 USD ($)	Feb. 28, 2021 GBP (£)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Convertible debt repaid							$ 0	$ 18,107,000
Loss on extinguishment of debt					$ 0	$ 0	0	790,000
Borrowings on lines of credit							156,420,000	97,746,000
Letters of credit outstanding, amount					50,200,000		50,200,000
Proceeds from financing obligation				$ 7,900,000
Long-term debt			$ 114,803,000		144,459,000		144,459,000
Current debt			19,210,000		22,484,000		22,484,000
Restricted cash and cash equivalents, current					4,400,000		4,400,000
Foreign operations
Debt Instrument [Line Items]
Current debt			11,800,000		11,900,000		11,900,000
Revolving credit facility | U K Subsidiary
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 2,600,000	£ 2,000,000	$ 8,300,000	£ 6,000,000
Quarterly principal payment | £		£ 350,000
Balloon payment | £										2,800,000
Long-term debt					10,400,000		10,400,000
Revolving credit facility | SONIA | U K Subsidiary
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
Convertible Notes due 2021
Debt Instrument [Line Items]
Convertible debt repaid			38,600,000
Repurchased face amount						18,300,000		18,300,000
Repurchase amount						$ 18,100,000		18,100,000
Loss on extinguishment of debt								$ 800,000
Convertible Notes due 2021 | Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount													$ 100,000,000
Interest rate, stated percentage													4.00%
ABL Facility | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000,000
Maximum borrowing capacity, option to increase	$ 250,000,000
Debt instrument, term	5 years
Line of credit facility, current borrowing capacity					155,300,000		155,300,000
Borrowings on lines of credit							110,000,000
Letters of credit outstanding, amount					1,400,000		1,400,000
Remaining borrowing capacity					$ 43,900,000		$ 43,900,000
Unused capacity, commitment fee percentage	0.375%						0.25%
Threshold for commitment fee	50.00%
Average daily unused portion, commitment fee	0.25%
Debt, weighted average interest rate					2.84%		2.84%
Fixed charge coverage ratio	1.00
Line of credit facility, covenant, minimum, fixed charge leverage ratio	4.00
Long-term debt			86,500,000		$ 110,000,000		$ 110,000,000
ABL Facility | Revolving credit facility | Fed Funds Effective Rate Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
ABL Facility | Revolving credit facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate							0.50%
ABL Facility | Revolving credit facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
ABL Facility | Revolving credit facility | BSBY
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
ABL Facility | Revolving credit facility | BSBY | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate							1.50%
ABL Facility | Revolving credit facility | BSBY | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Financing obligations
Debt Instrument [Line Items]
Debt, weighted average interest rate				5.40%
Long-term debt			6,610,000		5,040,000		$ 5,040,000
Term loan | Revolving credit facility
Debt Instrument [Line Items]
Long-term debt			$ 5,984,000		$ 7,967,000		$ 7,967,000
Term loan | Secured Debt | U K Subsidiary
Debt Instrument [Line Items]
Debt instrument, face amount									$ 9,100,000	£ 7,000,000