Derivative financial instruments (Tables)

3 Months Ended

Mar. 31, 2018

Derivative financial instruments [Abstract]

Fair value amount of derivative financial instruments

The breakdowns of the fair value amount of the derivative financial instruments as of March 31, 2018 and December 31, 2017 are as follows:

	Balance as of March 31, 2018				Balance as of December 31, 2017
($ in thousands)	Assets		Liabilities		Assets		Liabilities
Derivatives - cash flow hedge		10,983		320,366		8,230		329,731