Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2018

	March 31, 2018			December 31, 2017

Credit facility	$	184,000		$	150,000
Convertible senior debentures, due 2040		111,157			110,412
Convertible senior debentures, due 2041		57,031			56,641
Convertible senior debentures, due 2042		62,853			62,518
Deferred financing costs		(8,656	)		(9,101	)
		406,385			370,470
Less current portion		-			-
	$	406,385		$	370,470

Key terms of the convertible debentures

The following table summarizes some key facts and terms regarding the three series of outstanding convertible senior debentures following the adjustment made to the conversion rate of the debentures on the ex-dividend date of the March 29, 2018 dividend payment:

	Due 2040			Due 2041			Due 2042
Issuance date	November 9, 2010			May 13, 2011			May 31, 2012
Maturity date	November 15, 2040			May 15, 2041			June 1, 2042
Principal amount	$	275,000		$	150,000		$	150,000
Cash coupon rate (per annum)		2.25	%		2.25	%		2.25	%
Nonconvertible debt borrowing rate at issuance (per annum)		8.00	%		8.375	%		7.50	%
Conversion rate effective March 14, 2018 (per $1 principal amount)		77.4680			56.5321			91.0838
Effective conversion price effective March 14, 2018 (per share)	$	12.91		$	17.69		$	10.98
130% of the conversion price (per share)	$	16.78		$	23.00		$	14.27
Call date	November 20, 2020			May 20, 2021			June 7, 2022

Liability and equity of component of convertible senior debentures

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

	Principal amount of the debentures		Unamortized discount			Embedded derivative		Carrying value of liability component		Equity component (including temporary equity) - net carrying value
March 31, 2018
Due 2040	$	275,000		(164,143	)		300	$	111,157	$	110,094
Due 2041	$	150,000		(93,239	)		270	$	57,031	$	62,246
Due 2042	$	150,000		(87,276	)		129	$	62,853	$	57,874
Total	$	575,000	$	(344,658	)	$	699	$	231,041	$	230,214

December 31, 2017
Due 2040	$	275,000		(164,794	)		206	$	110,412	$	110,094
Due 2041	$	150,000		(93,573	)		214	$	56,641	$	62,246
Due 2042	$	150,000		(87,600	)		118	$	62,518	$	57,874
Total	$	575,000	$	(345,967	)	$	538	$	229,571	$	230,214

Convertible debentures, interest expense

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the fiscal quarters ended:

	Contractual coupon interest		Non-cash amortization of debt discount		Non-cash amortization of deferred financing costs		Non-cash change in value of derivative liability			Total interest expense related to the debentures
March 31, 2018
Due 2040	$	1,547		651		22		94		$	2,314
Due 2041	$	844		334		12		56		$	1,246
Due 2042	$	844		324		13		11		$	1,192
Total	$	3,235	$	1,309	$	47	$	161		$	4,752

April 1, 2017
Due 2040	$	1,547		602		22		(25	)	$	2,146
Due 2041	$	844		308		12		2		$	1,166
Due 2042	$	844		301		13		(4	)	$	1,154
Total	$	3,235	$	1,211	$	47	$	(27	)	$	4,466