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Credit Losses (Tables)
6 Months Ended
Jun. 30, 2021
Credit Loss [Abstract]  
Accounts receivable, allowance for credit loss The following table summarizes the changes in allowance for credit losses on our accounts receivables, certain non-trade accounts receivable and contract assets for the six months ended June 30, 2021 and 2020 (in thousands):
For the Six Months Ended June 30,
20212020
Balance as of beginning of period$(7,056)$(41)
Cumulative transition adjustment— (2,815)
Provision for credit losses(611)(260)
Charge-offs— 1,575 
Balance as of end of period$(7,667)$(1,541)