Leases (Tables)

12 Months Ended

Dec. 31, 2021

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense are as follows (dollars in thousands):

	Year ended December 31,
	2021		2020		2019
Operating lease cost	$	8,510	7,870		6,380
Short-term, variable and other lease costs	2,460		1,540		1,140
Total lease cost	$	10,970	$	9,410	$	7,520

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities are as follows (dollars in thousands):

Year ended December 31,	Operating Leases(a)
2022	$	8,500
2023	8,870
2024	7,990
2025	6,670
2026	6,540
Thereafter	18,930
Total lease payments	57,500
Less: Imputed interest	(5,600)
Present value of lease liabilities	$	51,900

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(a)     The maturity table excludes cash flows associated with exited lease facilities. Liabilities for exited lease facilities are included in accrued liabilities and other long-term liabilities in the accompanying consolidated balance sheet.