XML 41 R30.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Contract Assets      
Balance at beginning of period $ 18,622 $ 2,736 $ 2,736
Change due to acquisitions / disposals 2,378   9,509
Change related to credit allowance 45   (79)
Other changes in the period (6,073)   6,456
Balance at end of period 14,972   18,622
Contract Liabilities      
Balance at beginning of period 226,237 166,918 166,918
Change due to acquisitions / disposals 18,084   39,885
Other changes in the period 257   19,434
Balance at end of period 244,578   $ 226,237
Revenue related to our contract liabilities $ 204,600    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Contract Liabilities      
Revenue related to our contract liabilities   $ 164,400