SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)

12 Months Ended

Dec. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

Accounts payable and accrued liabilities consisted of the following:

	December 31,
	2017		2016
Accounts payable and accrued operating expenses	$	166,616	$	191,353
Accrued compensation expense		140,781		109,038
Accrued rebates payable		36,472		34,737
Accrued royalties payable		18,820		15,151
Value added taxes payable		9,740		7,848
Forward foreign currency exchange contracts		14,464		5,201
Accrued income taxes		5,528		—
Other		9,500		7,177
Total accounts payable and accrued liabilities	$	401,921	$	370,505

Schedule of Estimated Accrued Rebates and Reserve for Cash Discounts

The roll forward of significant estimated accrued rebates and reserve for cash discounts for the years ended December 31, 2017, 2016 and 2015 were as follows:

	Balance at Beginning of Period		Provision for Current Period Sales		Provision/ (Reversals) for Prior Period Sales			Actual Charges Related to Current Period Sales			Actual Charges Related to Prior Period Sales			Balance at End of Period
Year ended December 31, 2017:
Accrued rebates	$	34,737	$	56,282	$	(3,686	)	$	(31,714	)	$	(19,147	)	$	36,472
Reserve for cash discounts		888		10,730		(58	)		(9,601	)		(904	)		1,055
Year ended December 31, 2016:
Accrued rebates	$	32,553	$	44,347	$	(5,205	)	$	(23,879	)	$	(13,079	)	$	34,737
Reserve for cash discounts		831		8,889		(22	)		(8,160	)		(650	)		888
Year ended December 31, 2015:
Accrued rebates	$	14,859	$	45,356	$	(1,245	)	$	(18,421	)	$	(7,996	)	$	32,553
Reserve for cash discounts		688		7,402		—			(6,722	)		(537	)		831