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Equipment and leasehold improvements (Details Textual) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Gain on sale of premises and equipment	$ 5,600us-gaap_GainLossOnSaleOfPropertyPlantEquipment	$ 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment	[1]	$ 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment	[1]	$ 5,626us-gaap_GainLossOnSaleOfPropertyPlantEquipment	[1]
[1] The numbers set out in these tables have been rounded and accordingly may not total exactly.

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration