Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

Summary of Opening and Closing Balances of Company's Customer Receivables and Current and Long-term Contract Liabilities

The opening and closing balances of the Company’s customer receivables and current and long-term contract liabilities balances are as follows:

(Dollars in thousands)	September 30, 2021		December 31, 2020		Change
Customer receivables	$	82,717	$	40,785	$	41,932
Contract liabilities—current		7,193		8,249		(1,056	)
Contract liabilities—noncurrent		11,026		13,106		(2,080	)