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v3.19.1

Long-term debt - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) vessel | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |
Repayments of borrowings | $ 213,622,000 | $ 56,997,000
Accretion of deferred financing costs | $ 3,600,000 | $ 3,100,000
Egypt limited recourse debt facilities | Egypt entity |  |
Disclosure of detailed information about borrowings [line items] |  |
Percentage of gas requirements (greater than) | 70.00% |
Egypt limited recourse debt facilities | Minimum | LIBOR |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 0.90% |
Egypt limited recourse debt facilities | Maximum | LIBOR |  |
Disclosure of detailed information about borrowings [line items] |  |
Basis spread, percent | 1.60% |
Other limited recourse debt facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Repayments of borrowings | $ 60,600,000 |
Other limited recourse debt facilities | 50% owned subsidiary |  |
Disclosure of detailed information about borrowings [line items] |  |
Ownership rate | 50.00% |
Other limited recourse debt facilities, 5.35% due September 30, 2033 |  |
Disclosure of detailed information about borrowings [line items] |  |
Number of vessels to be acquired | vessel | 2 |
Other limited recourse debt facilities, 5.35% due September 30, 2033 | 50% owned subsidiary |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | $ 86,000,000 |
Other limited recourse debt facilities, 5.35% due September 30, 2033 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.35% |
Other limited recourse debt facilities, 5.58% due June 30, 2031 |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | $ 80,000,000 |
Other limited recourse debt facilities, 5.58% due June 30, 2031 | Fixed interest rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, interest rate | 5.58% |
Revolving credit facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | $ 300,000,000 |
Debt covenant, EBITDA to interest coverage ratio | 2 |
Debt covenant, debt to capitalization ratio (less than or equal) | 55.00% |
Default payment accelerated by a creditor, amount of indebtedness (or more) | $ 50,000,000 |
Default that permits a creditor to demand repayment, amount of indebtedness (or more) | $ 50,000,000 |

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