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Equity (Stock Repurchase Program) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2014 | Sep. 30, 2013
Stock Repurchase Program |  |  |
Repurchase of common stock, authorized amount |  |  | $ 50,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Available repurchase of common stock, authorized amount |  | 29,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |
Treasury stock, shares, acquired | 1.7us-gaap_TreasuryStockSharesAcquired |  |
Treasury stock value acquired including acquisition costs | $ 21,000,000star_TreasuryStockValueAcquiredIncludingAcquisitionCosts |  |
Treasury stock acquired, average cost per share | $ 12.35us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |

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- Details
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- Definition Value of treasury stock acquired excluding costs for acquiring the shares. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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