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v2.4.1.9

Shareholders' equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 41 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 01, 2011 | Jul. 31, 2008
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Repurchase of common stock (in shares) |  | 4,786,521 us-gaap_TreasuryStockSharesAcquired |  |  |  |
Common stock, shares authorized (in shares) |  | 195,000,000 us-gaap_CommonStockSharesAuthorized | 195,000,000 us-gaap_CommonStockSharesAuthorized | 195,000,000 us-gaap_CommonStockSharesAuthorized |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 60,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Treasury stock acquired, Aggregate purchase price | 4,033 us-gaap_TreasuryStockValueAcquiredCostMethod | 49,924 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |
Stock repurchase program, Remaining authorized repurchase amount |  | $ 10,076 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | 10,076 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Series A Preferred stock, shares authorized (in shares) |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |
Series A Preferred stock, shares issued (in shares) |  | 160,000 us-gaap_PreferredStockSharesIssued | 160,000 us-gaap_PreferredStockSharesIssued | 160,000 us-gaap_PreferredStockSharesIssued |  | 160,000 us-gaap_PreferredStockSharesIssued
Preferred Stock, Par or Stated Value Per Share |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |
Preferred Stock, Liquidation Preference Per Share |  | $ 0.01 us-gaap_PreferredStockLiquidationPreference | 0.01 us-gaap_PreferredStockLiquidationPreference |  |  |
Conversion of convertible preferred stock (in shares) |  | 100 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion | 100 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance | 80,718 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  | 79,620 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 80,283 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |
Repurchase of common stock (in shares) | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |
Conversion of convertible preferred stock (in shares) | (435)us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  | (1,479)us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | (663)us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |
Issuance for share-based compensation plans (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |
Shares, Ending balance | 80,283 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 78,141 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 78,141 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember | 79,620 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |
Treasury stock, at cost [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance | 4,386,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Repurchase of common stock (in shares) | 400,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |  |  |  |
Conversion of convertible preferred stock (in shares) | 0 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  | 0 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 0 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Issuance for share-based compensation plans (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Shares, Ending balance | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember | 4,786,521 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_TreasuryStockMember |  |
Common stock [Member] |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares, Beginning balance | 88,844,327 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 88,710,277 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 88,548,637 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Repurchase of common stock (in shares) | (400,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |
Conversion of convertible preferred stock (in shares) | 43,556 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 147,952 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 66,244 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Issuance for share-based compensation plans (in shares) | 60,754 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 206,353 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 95,396 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Shares, Ending balance | 88,548,637 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 89,064,582 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 89,064,582 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 88,710,277 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |

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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 The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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