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Commitments and contingencies (Debt Covenant Ratios) (Details) | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Fixed Charge Coverage Ratio | 1.70 | 1.81 | 1.74 | 1.70 | 1.77 | 1.69 | 1.65 | 1.65 | 1.64 | 1.67 | 1.64 | 1.67
Leverage Ratio | 4.07 | 3.83 | 4.02 | 4.05 | 3.80 | 4.02 | 4.05 | 4.12 | 4.21 | 4.08 | 4.40 | 4.80

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- Definition Debt Instrument, Covenant Terms, Ratio of Indebtedness to Earnings Before Interest, Taxes, Depreciation and Amortization + References No definition available. + Details
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