Restricted Cash, Deposits and Marketable Securities (Narrative) (Details)	6 Months Ended
Jun. 30, 2019
Disclosure of financial assets [line items]
Bonds coupon rate	4.435%
Bonds Maturity date	Dec. 30, 2020
Bonds rating	Baa3
WACHOVIA [Member]
Disclosure of financial assets [line items]
Annual interest rate	5.80%

The description of credit rating agencies used to evaluate the credit quality of the entity's financial assets. [Refer: Financial assets]

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-URIDate 2019-03-27

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