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Cash and cash equivalents (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents [abstract]
Cash at bank and in hand	$ 13,300,000	$ 13,600,000	$ 36,900,000
Overdrafts	(4,200,000)	0	0
Cash, net	9,100,000	13,600,000	$ 36,900,000	$ 14,600,000
Cash held in escrow	$ 700,000	$ 0

X

- Definition

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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- Definition

Cash And Cash Equivalents, Net

+ References

No definition available.

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- Definition

Cash Held In Escrow

+ References

No definition available.

+ Details

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