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SUPPLEMENTAL BALANCE SHEET INFORMATION
 12 Months Ended
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
SUPPLEMENTAL BALANCE SHEET INFORMATION SUPPLEMENTAL BALANCE SHEET INFORMATION
Accounts Payable and Accrued Liabilities consisted of the following:
December 31,
20192018
Accounts payable and accrued operating expenses$240,981  $207,620  
Accrued compensation expense192,467  149,937  
Accrued rebates payable57,163  43,116  
Accrued royalties payable30,797  19,977  
Deferred revenue13,037  1,467  
Value added taxes payable8,395  7,785  
Forward foreign currency exchange contracts10,448  4,178  
Lease liability10,700  —  
Other6,633  3,210  
Total accounts payable and accrued liabilities$570,621  $437,290  
The roll forward of significant estimated accrued rebates and reserve for cash discounts for the years ended December 31, 2019, 2018 and 2017, were as follows:
Balance at
Beginning
of Period
Provision for Current Period SalesPayments
Balance at
End of
Period
Year ended December 31, 2019:
Accrued rebates$43,116  $91,748  $(77,701) $57,163  
Reserve for cash discounts$1,197  $15,335  $(14,643) $1,889  
Year ended December 31, 2018:
Accrued rebates$36,472  $67,843  $(61,199) $43,116  
Reserve for cash discounts$1,055  $12,474  $(12,332) $1,197  
Year ended December 31, 2017:
Accrued rebates$34,737  $52,596  $(50,861) $36,472  
Reserve for cash discounts$888  $10,672  $(10,505) $1,055