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Derivative assets (Income (loss) recorded in comprehensive income) (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Effective portion of change in fair market value of derivatives | $ 17,049 | $ 6,846 | $ 385
Net changes in cash flow hedges, Income tax effect | (2,131) | (856) | (47)
Net change in fair value of derivatives, net of tax | $ 14,918 | $ 5,990 | $ 338

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