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Significant accounting policies - Earnings per Share (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Diluted (in dollars per share) | $ (0.06)us-gaap_EarningsPerShareDiluted | $ 0.75 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ (0.40)us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.61 us-gaap_EarningsPerShareDiluted | $ 1.75 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 2.54 us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted
Diluted number of common shares outstanding (in shares) | 103,295,920 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 106,390,339 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 90,915,805 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,254,268 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,083,675 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,820,844 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,551,830 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,147,972 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 106,454,775 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 83,453,835 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,492,979 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 88,970,531 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,598,236 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
As originally reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) |  |  | $ 0.46 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.30 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.85 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.69 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.45 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ (0.40)us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.35 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | $ 1.15 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ (0.01)us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | $ 1.59 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 0.44 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | $ 1.14 us-gaap_EarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Diluted number of common shares outstanding (in shares) |  |  | 100,176,416 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 87,895,953 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 87,777,462 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 87,866,613 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 87,888,983 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 85,335,404 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 87,836,378 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 92,438,629 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 87,031,196 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 87,253,760 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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