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Basis of presentation and summary of significant accounting policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Understatement in net cash provided by operating activities	$ (66,267)us-gaap_NetCashProvidedByUsedInOperatingActivities	$ (20,914)us-gaap_NetCashProvidedByUsedInOperatingActivities
Understatement in net cash used for investing activities	77,172us-gaap_NetCashProvidedByUsedInInvestingActivities	7,901us-gaap_NetCashProvidedByUsedInInvestingActivities
Scenario, Adjustment [Member]
Understatement in net cash provided by operating activities		3,200us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Understatement in net cash used for investing activities		$ 3,200us-gaap_NetCashProvidedByUsedInInvestingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember

X

- Definition

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585

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X

- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

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