Grants and other liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Grants and other liabilities [Abstract]

Grants and other non-current liabilities

	Balance as of September 30,		Balance as of December 31,
	2019		2018
	($ in thousands)
Grants		1,103,953		1,150,805
Other Liabilities		536,251		507,321
Grant and other non-current liabilities		1,640,204		1,658,126