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Shareholders’ equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended | 26 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in shares) |  | 195,000,000 | 195,000,000 | 195,000,000
Stock repurchase program, Authorized Amount | $ 60,000 |  |  |
Number of shares Treasury stock acquired (in shares) |  |  | 4,786,521 |
Treasury stock acquired, Aggregate purchase price |  |  | 49,924 |
Stock repurchase program, Remaining authorized repurchase amount |  | $ 10,076 |  |
Series A Convertible Preferred Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, Beginning balance |  | 80,283 |  |
Conversion of convertible preferred stock (in shares) |  | (549) |  |
Issuance for stock compensation plans (in shares) |  | 0 |  |
Shares, Ending balance |  | 79,734 | 79,734 |
Treasury Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, Beginning balance |  | 4,786,521 |  |
Conversion of convertible preferred stock (in shares) |  | 0 |  |
Issuance for stock compensation plans (in shares) |  | 0 |  |
Shares, Ending balance |  | 4,786,521 | 4,786,521 |
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares, Beginning balance |  | 88,548,637 |  |
Conversion of convertible preferred stock (in shares) |  | 54,825 |  |
Issuance for stock compensation plans (in shares) |  | 79,469 |  |
Shares, Ending balance |  | 88,682,931 | 88,682,931 |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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