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Share-based compensation - Schedule of management and director options outstanding (Details) (USD $) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options outstanding (in shares) | 11,329,911.000 |  | 10,981,075.000 | 10,956,838
Options outstanding, weighted average exercise price (in dollars per share) | $ 13.38 |  | $ 13.23 | $ 13.20
Remaining contractual life | 7 years 7 months 6 days | 8 years 1 month 6 days |  |
Management and director options |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options outstanding (in shares) | 11,329,911.000 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 13.38 |  |  |
Options exercisable (in shares) | 3,911,311.000 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 13.22 |  |  |
Management and director options | $10.00-$10.89 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price, lower limit (in dollars per share) | $ 10.00 |  |  |
Exercise price, upper limit (in dollars per share) | $ 10.89 |  |  |
Options outstanding (in shares) | 6,588,647 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 10.03 |  |  |
Options exercisable (in shares) | 2,346,787 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 10.02 |  |  |
Management and director options | $15.05-$16.89 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price, lower limit (in dollars per share) | $ 15.05 |  |  |
Exercise price, upper limit (in dollars per share) | $ 16.89 |  |  |
Options outstanding (in shares) | 2,405,516 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 15.94 |  |  |
Options exercisable (in shares) | 782,262 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 16.02 |  |  |
Management and director options | $20.00-$25.05 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise price, lower limit (in dollars per share) | $ 20.00 |  |  |
Exercise price, upper limit (in dollars per share) | $ 25.05 |  |  |
Options outstanding (in shares) | 2,335,748 |  |  |
Options outstanding, weighted average exercise price (in dollars per share) | $ 20.21 |  |  |
Options exercisable (in shares) | 782,262 |  |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ 20.02 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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