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Other long-term liabilities - Convertible Debentures (Details)		12 Months Ended
	Mar. 01, 2016 CAD ($) shares $ / instrument	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Debt conversion, shares issued (in shares) | shares		56,926	108,370,081
Convertible Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, effective interest rate		0.00%
Convertible Unsecured Subordinated Debentures | Convertible Subordinated Debt
Debt Instrument [Line Items]
Long-term debt		$ 470,000	$ 971,000
Par value	$ 1,150,000,000
Maturity date	5.00%
Proceeds from issuance of debt			571,642,000	$ 266,889,000
Debt instrument, convertible, price per instrument (USD per debenture) | $ / instrument	1,000,000
interest expense		0	7,193,000
Debt instrument, convertible, number of equity instruments (in shares) | shares	108,490,566
Principle converted amount		$ 447,000	$ 855,691,000
Debt conversion, shares issued (in shares) | shares		56,926,000	108,370,081
Debt instrument, convertible debt, percentage of shares issued		0.999

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Debt Instrument, Convertible, Price per Instrument

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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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.

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

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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