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Shareholders’ equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 35 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 31, 2011 | Jun. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Series A Convertible Preferred Stock [Member] | Jun. 30, 2013 Series A Convertible Preferred Stock [Member] | Jun. 30, 2014 Treasury Stock [Member] | Jun. 30, 2013 Treasury Stock [Member] | Jun. 30, 2014 Common Stock [Member] | Jun. 30, 2013 Common Stock [Member]
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 |  |  |  |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 4,786,521 |  |  |  |  |  |  |
Repurchase of common stock, aggregate purchase price |  |  | 49,924 |  |  |  |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 10,076 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |
Shares, Beginning balance |  |  |  |  | 79,620 | 80,283 | 4,786,521 | 4,786,521 | 88,710,277 | 88,548,637
Conversion of convertible preferred stock (in shares) |  |  |  |  | (394) | (199) | 0 | 0 | 39,455 | 19,864
Issuance for stock compensation plans (in shares) |  |  |  |  | 0 | 0 | 0 | 0 | 55,029 | 34,208
Shares, Ending balance |  |  |  |  | 79,226 | 80,084 | 4,786,521 | 4,786,521 | 88,804,761 | 88,602,709

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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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