Grants and other liabilities (Tables)

6 Months Ended

Jun. 30, 2019

Grants and other liabilities [Abstract]

Grants and other non-current liabilities

	Balance as of June 30,		Balance as of December 31,
	2019		2018
	($ in thousands)
Grants		1,117,517		1,150,805
Other Liabilities		532,454		507,321
Grant and other non-current liabilities		1,649,971		1,658,126