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Convertible Unsecured Subordinated Debentures - Narrative (Details)		12 Months Ended
	Mar. 01, 2016 CAD shares trading_days CAD / instrument	Dec. 31, 2017 CAD shares	Dec. 31, 2016 CAD shares	Mar. 14, 2017	Feb. 02, 2017
Debt Instrument [Line Items]
Maturity date				2.33%
Deferred financing costs		CAD 4,448,000	CAD 10,198,000
Debt conversion, shares issued (in shares) | shares		108,370,081	0
Convertible Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, effective interest rate					0.00%
Convertible Subordinated Debt | Convertible Unsecured Subordinated Debentures
Debt Instrument [Line Items]
Face value	CAD 1,150,000,000	CAD 1,277,000
Maturity date	5.00%	5.00%
Debt instrument, convertible, price per instrument (CAD per debenture) | CAD / instrument	1,000,000
Debt instrument, convertible, price per instrument paid at closing (CAD per debenture) | CAD / instrument	333,000
Debt instrument, convertible, price per instrument outstanding (CAD per debenture) | CAD / instrument	667,000
Proceeds from issuance of debt		CAD 743,881,000	CAD 357,694,000
interest expense		CAD 9,373,000	CAD 48,205,000
Debt instrument, convertible, number of equity instruments (in shares) | shares	108,490,566
Debt conversion, shares issued (in shares) | shares		108,370,081
Debt instrument, convertible debt, percentage of shares issued		0.999
Percentage of weighted average trading price	95.00%
Threshold consecutive trading days | trading_days	20

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Debt Instrument, Convertible, Price per Instrument

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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