FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

The Company measures certain financial assets and liabilities at fair value on a recurring basis. In addition to available-for-sale debt securities, debt and foreign currency derivatives, which are disclosed in Notes 6, 10 and 11, respectively, the following tables below present the classification within fair value hierarchy of financial assets and liabilities not disclosed elsewhere.

	Fair Value Measurements at September 30, 2018
	Quoted Price in Active Markets For Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Other current assets:
NQDC Plan assets	$	—	$	426	$	—	$	426
Restricted investments (1)		—		11,217		—		11,217
Total other current assets		—		11,643		—		11,643
Other assets:
NQDC Plan assets		—		13,928		—		13,928
Restricted investments (1)		—		2,336		—		2,336
Strategic investments (2)		2,934		—		—		2,934
Total other assets		2,934		16,264		—		19,198
Total assets	$	2,934	$	27,907	$	—	$	30,841
Liabilities:
Current liabilities:
NQDC Plan liability	$	1,219	$	426	$	—	$	1,645
Contingent acquisition consideration		—		—		86,204		86,204
Total current liabilities		1,219		426		86,204		87,849
Other long-term liabilities:
NQDC Plan liability	$	19,020	$	13,928		—		32,948
Contingent acquisition consideration		—		—		58,160		58,160
Total other long-term liabilities		19,020		13,928		58,160		91,108
Total liabilities	$	20,239	$	14,354	$	144,364	$	178,957

	Fair Value Measurements at December 31, 2017
	Quoted Price in Active Markets For Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Other current assets:
NQDC Plan assets	$	—	$	967	$	—	$	967
Restricted investments (1)		—		15,647		—		15,647
Total other current assets		—		16,614		—		16,614
Other assets:
NQDC Plan assets	—			11,859		—		11,859
Total other assets		—		11,859		—		11,859
Total assets	$	—	$	28,473	$	—	$	28,473
Liabilities:
Current liabilities:
NQDC Plan liability	$	1,356	$	967	$	—	$	2,323
Contingent acquisition consideration	—		—			53,648		53,648
Total current liabilities		1,356		967		53,648		55,971
Other long-term liabilities:
NQDC Plan liability		18,272		11,859	—			30,131
Contingent acquisition consideration	—		—			135,318		135,318
Total other long-term liabilities		18,272		11,859		135,318		165,449
Total liabilities	$	19,628	$	12,826	$	188,966	$	221,420

(1)   The restricted investments at September 30, 2018 and December 31, 2017 secure the Company’s irrevocable standby letters of credit obtained in connection with certain commercial agreements.

(2) The Company has investments in marketable equity securities measured using quoted prices in an active market that are considered strategic investments and included in other assets on the Company’s Consolidated Balance Sheets.  

Liabilities Measured at Fair Value Using Level 3 Inputs

Contingent acquisition consideration at December 31, 2017	$	188,966
Changes in the fair value of other contingent acquisition consideration		19,293
Milestone payments to Ares Trading S.A. (Merck Serono)		(61,607	)
Foreign exchange remeasurement of Euro denominated contingent    acquisition consideration		(2,288	)
Contingent acquisition consideration at September 30, 2018	$	144,364