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Equity (Stock Repurchase Program) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Sep. 30, 2013
Stock Repurchase Program
Repurchase of common stock, authorized amount		$ 50,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Treasury stock, shares, acquired	44,000us-gaap_TreasuryStockSharesAcquired
Treasury stock value acquired including acquisition costs	600,000star_TreasuryStockValueAcquiredIncludingAcquisitionCosts
Treasury stock acquired, average cost per share	$ 12.66us-gaap_TreasuryStockAcquiredAverageCostPerShare
Available repurchase of common stock, authorized amount	$ 28,500,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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
Balance Type:	debit
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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
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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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Data Type:	xbrli:sharesItemType
Balance Type:	na
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