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

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- 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 + Details
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- 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 + Details
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