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Long-term debt (Tables)

12 Months Ended

Dec. 31, 2017

Financial Instruments [Abstract]

Schedule of long-term debt



As at	Dec 31 2017			Dec 31 2016
Unsecured notes
(i) 3.25% due December 15, 2019	$	348,060		$	347,126
(ii) 5.25% due March 1, 2022	248,072			247,685
(iii) 4.25% due December 1, 2024	296,873			296,529
(iv) 5.65% due December 1, 2044	295,158			295,084
	1,188,163			1,186,424
Egypt limited recourse debt facilities	241,190			288,515
Other limited recourse debt facilities	72,918			81,267
Total long-term debt¹	1,502,271			1,556,206
Less current maturities¹	(55,905		)	(53,997		)
	$	1,446,366		$	1,502,209


¹	Long-term debt and current maturities are presented net of discounts and deferred financing fees of $17.8 million as at December 31, 2017 (2016 - $17.8 million).

Schedule of minimum principal payments for long-term debt

The minimum principal payments for long-term debt in aggregate and for each of the five succeeding years are as follows:



	Limited recourse debt facilities			Unsecured notes			Total
2018	$	57,072		$	—		$	57,072
2019	60,100			350,000			410,100
2020	62,115			—			62,115
2021	109,462			—			109,462
2022	31,279			250,000			281,279
Thereafter	—			600,000			600,000
	$	320,028		$	1,200,000		$	1,520,028