Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Long-Term Debt [Abstract]

Schedule of long-term debt instruments

Long-term debt consists of the following:

	December 31, 2015			December 31, 2014
Credit facility	$	190,000		$	200,000
Exchangeable unsecured notes, due 2102		38,642			38,642
Convertible senior debentures, due 2040		106,011			103,841
Convertible senior debentures, due 2041		54,424			53,249
Convertible senior debentures, due 2042		60,320			59,190
Deferred financing costs		(12,659	)		(10,867	)
		436,738			444,055
Less current portion		-			-
	$	436,738		$	444,055

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 December 22, 2015 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 December 1, 2015 (per $1 principal amount)		74.7087			54.5185			87.8395
Effective conversion price effective December 1, 2015 (per share)	$	13.39		$	18.34		$	11.38
130% of the conversion price (per share)	$	17.41		$	23.84		$	14.79
Call date	November 20, 2020			May 20, 2021			June 7, 2022

Liability and equity components of the convertible debentures

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

	Principal amount of the debentures		Unamortized discount			Embedded derivative		Carrying value of liability component		Equity component - net carrying value
December 31, 2015
Due 2040	$	275,000		(169,565	)		576	$	106,011	$	110,094
Due 2041	$	150,000		(96,014	)		438	$	54,424	$	62,246
Due 2042	$	150,000		(89,982	)		302	$	60,320	$	57,874
Total	$	575,000	$	(355,561	)	$	1,316	$	220,755	$	230,214
December 31, 2014
Due 2040	$	275,000		(171,685	)		526	$	103,841	$	110,094
Due 2041	$	150,000		(97,092	)		341	$	53,249	$	62,246
Due 2042	$	150,000		(91,048	)		238	$	59,190	$	57,874
Total	$	575,000	$	(359,825	)	$	1,105	$	216,280	$	230,214

Schedule of Interest Expense on Convertible Debt [Table Text Block]

Interest expense related to the debentures is reflected on the consolidated statements of operations for the years ended December 31:

	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
2015
Due 2040	$	6,188		2,120		88		50		$	8,446
Due 2041	$	3,375		1,078		47		97		$	4,597
Due 2042	$	3,375		1,066		54		64		$	4,559
Total	$	12,938	$	4,264	$	189	$	211		$	17,602
2014
Due 2040	$	6,188		1,960		88		35		$	8,271
Due 2041	$	3,375		993		47		(8	)	$	4,407
Due 2042	$	3,375		990		54		41		$	4,460
Total	$	12,938	$	3,943	$	189	$	68		$	17,138
2013
Due 2040	$	6,188		1,811		88		(131	)	$	7,956
Due 2041	$	3,375		915		47		(50	)	$	4,287
Due 2042	$	3,375		920		54		(85	)	$	4,264
Total	$	12,938	$	3,646	$	189	$	(266	)	$	16,507

Aggregate annual maturities of long-term debt

Other Borrowings Information

Aggregate annual maturities of long-term debt, based on the terms stated in the respective agreements, are as follows:

2016	$	-
2017		-
2018		-
2019		-
2020		190,000
Thereafter		613,642