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Equity (Stock Repurchase Program) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended
	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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X

- Definition

Value of treasury stock acquired excluding costs for acquiring the shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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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

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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

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