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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Schedule of correct diluted earnings per share amounts and weighted average number of dilutive shares outstanding | The following tables summarize the correct diluted earnings per share amounts and weighted average number of dilutive shares outstanding amounts for the prior periods.
|  | Three months ended
|  | March 31, 2012 |  | June 30, 2012 (1) |  | September 30, 2012 |  | December 31, 2012 |  | March 31, 2013 |  | June 30, 2013 |  | September 30, 2013
|  | (unaudited)
Diluted EPS (as originally reported): |  | $ | 0.35 |  |  | $ | (0.40 | ) |  | $ | 0.45 |  |  | $ | 0.69 |  |  | $ | 0.85 |  |  | $ | 0.30 |  |  | $ | 0.46 |
Diluted EPS (as corrected): |  | $ | 0.38 |  |  | $ | (0.40 | ) |  | $ | 0.50 |  |  | $ | 0.76 |  |  | $ | 0.93 |  |  | $ | 0.33 |  |  | $ | 0.51 |
Weighted Average Number of Dilutive Shares Outstanding (as originally reported): |  | 85,335,404 |  |  | 78,432,132 |  |  | 87,888,983 |  |  | 87,866,613 |  |  | 87,777,462 |  |  | 87,895,953 |  |  | 100,176,416 |
Weighted Average Number of Dilutive Shares Outstanding (as corrected): |  | 78,432,132 |  |  | 78,432,132 |  |  | 78,551,830 |  |  | 78,820,844 |  |  | 79,083,675 |  |  | 79,254,268 |  |  | 90,915,805 |
|  | Six months ended |  | Nine months ended |  | Year ended December 31, 2012 |  |  |  |
|  | June 30, 2012 (1) |  | June 30, 2013 |  | September 30, 2012 |  | September 30, 2013 |  |  |  |  |
|  | (unaudited) |  | (unaudited) |  | (audited) |  |  |  |
Diluted EPS (as originally reported): |  | $ | (0.01 | ) |  | $ | 1.15 |  |  | $ | 0.44 |  |  | $ | 1.59 |  |  | $ | 1.14 |  |  |  |  |
Diluted EPS (as corrected): |  | $ | (0.01 | ) |  | $ | 1.26 |  |  | $ | 0.49 |  |  | $ | 1.75 |  |  | $ | 1.26 |  |  |  |  |
Weighted Average Number of Dilutive Shares Outstanding (as originally reported): |  | 78,432,132 |  |  | 87,836,378 |  |  | 87,031,196 |  |  | 92,438,629 |  |  | 87,253,760 |  |  |  |  |
Weighted Average Number of Dilutive Shares Outstanding (as corrected): |  | 78,432,132 |  |  | 79,147,972 |  |  | 78,492,979 |  |  | 83,453,835 |  |  | 78,598,236 |  |  |  |  |
(1) Prior periods with a net loss correctly presented diluted earnings per share.

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22644-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22663-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22658-107794 + Details
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