DEBT (Tables)

3 Months Ended

Jun. 30, 2016

DEBT

Information related to availability on Credit Agreement

	June 30, 2016		March 31, 2016
Available borrowings	$	98,266	$	98,335
Outstanding letters of credit		1,731		1,664

1.75% Convertible Notes due 2016

DEBT

Schedule of additional information related to convertible notes

	June 30, 2016		March 31, 2016
Additional paid-in capital	$	51,180	$	51,180
Principal amount of 1.75% Convertible Notes	$	250,000	$	250,000
Unamortized discount of the liability component		5,051		8,014
Carrying amount of debt issuance costs		412		657
Net carrying amount of 1.75% Convertible Notes	$	244,537	$	241,329

Schedule of components of interest expense related to convertible notes

	Three Months Ended June 30,
	2016		2015
Cash interest expense (coupon interest expense)	$	1,094	$	1,094
Non-cash amortization of discount on 1.75% Convertible Notes		2,963		2,773
Amortization of debt issuance costs		245		256
Total interest expense related to 1.75% Convertible Notes	$	4,302	$	4,123

1.00% Convertible Notes due 2018

DEBT

Schedule of additional information related to convertible notes

	June 30, 2016		March 31, 2016
Additional paid-in capital	$	35,784	$	35,784
Principal amount of 1.00% Convertible Notes	$	287,500	$	287,500
Unamortized discount of the liability component		26,837		29,972
Carrying amount of debt issuance costs		815		922
Net carrying amount of 1.00% Convertible Notes	$	259,848	$	256,606

Schedule of components of interest expense related to convertible notes

	Three Months Ended June 30,
	2016		2015
Cash interest expense (coupon interest expense)	$	719	$	719
Non-cash amortization of discount on 1.00% Convertible Notes		3,135		2,954
Amortization of debt issuance costs		107		112
Total interest expense related to 1.00% Convertible Notes	$	3,961	$	3,785