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Derivative financial instruments (Income (loss) recorded in comprehensive income) (Details) - Interest rate swaps - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion of change in fair market value of derivatives	$ (16,639)	$ 17,049	$ 6,846
Net changes in cash flow hedges, Income tax effect	2,080	(2,131)	(856)
Net change in fair value of derivatives, net of tax	$ (14,559)	$ 14,918	$ 5,990

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss), attributable to parent entity.

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