LONG TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of principal payments on the Company's Term Debt

The carrying values of the liability's components are reflected in the Company's accompanying consolidated balance sheets as follows:

	December 31,
	2018			2017
Principal	$	215,000		$	215,000
Less: Debt issuance costs, net of amortization		(2,692	)		(3,486	)
Net liability carrying amount	$	212,308		$	211,514

Schedule of Component of Term Debt Liability

Interest expense related to the liability is reflected on the accompanying consolidated statements of income for the years ended:

	December 31,
	2018			2017
Amortization of debt issuance costs	$	794		$	6,334
Interest expense		7,083			5,558
Total interest expense recognized	$	7,877		$	11,892
Effective interest rate		3.80	%		3.30	%

Schedule of interest Expense Recognized

In January 2017, the Company issued $287,500 aggregate principal amount of Exchangeable Senior Notes (the "Notes") due 2024. The following table summarizes some key facts and terms regarding the outstanding Notes:

	Due 2024
Issuance date	January 18, 2017
Maturity date	January 15, 2024
Principal amount	$	287,500
Cash coupon rate (per annum)		1.25	%
Conversion rate effective September 15, 2023 (per $1000 principal amount)		12.026
Effective conversion price effective September 15, 2023 (per ADS)	$	83.15

Schedule of Outstanding Exchangeable Note

The carrying values of the liability and equity components of the Notes are reflected in the Company's accompanying consolidated balance sheets as follows:

	December 31,
	2018			2017
Principal	$	287,500		$	287,500
Less:
Debt issuance costs, net of amortization		(4,488	)		(5,182	)
Unamortized discount		(39,335	)		(46,190	)
Net liability carrying amount	$	243,677		$	236,128
Equity component - net carrying value	$	51,176		$	51,176

Schedule of Carring Values

Interest expense related to the Notes is reflected on the accompanying consolidated statements of income as follows:
 

	Year Ended December 31,
	2018			2017
Amortization of debt issuance costs	$	694		$	609
Non-cash amortization of debt discount		6,855			6,278
Interest expense		3,594			3,414
Net liability carrying amount	$	11,143		$	10,301
Equity component - net carrying value		4.68	%		4.68	%