Loans Receivable and Other Lending Investments, net (Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Securities, Amortized Cost Basis	$ 1,020
Available-for-sale Securities, Net Unrealized Gain (Loss)	147	(18)
Available-for-sale Securities, Debt Securities, Fair Value	1,167
Investments, Debt and Equity Securities [Abstract]
Face Value	177,274star_DebtSecuritiesFaceAmount	140,897star_DebtSecuritiesFaceAmount
Amortized Cost Basis	187,524star_DebtSecuritiesAmortizedCostBasis	141,945star_DebtSecuritiesAmortizedCostBasis
Net Carrying Amount	187,671star_DebtSecuritiesNetCarryingAmount	141,927star_DebtSecuritiesNetCarryingAmount
Estimated Fair Value	191,366star_DebtSecuritiesFairValue	141,927star_DebtSecuritiesFairValue
Held-to-maturity Securities, Debt Maturities [Abstract]
Held-to-Maturity Securities, Amortized Cost Basis	186,504
Held-to-maturity Securities, Fair Value	190,199
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	186,504
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value	0
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value	190,199
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	0
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	0
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	0
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	1,020
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	0
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	0
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	0
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	1,167
Municipal Bonds
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Available-for-sale Securities, Face Value	1,020	1,055
Available-for-sale Securities, Amortized Cost Basis	1,020	1,055
Available-for-sale Securities, Net Unrealized Gain (Loss)	147	(18)
Available-for-sale Securities, Debt Securities, Fair Value	1,167	1,037
Available-for-sale Securities, Debt Securities	1,167	1,037
Corporate Debt Securities
Held-to-maturity Securities, Debt Maturities [Abstract]
Held-to-Maturity Securities, Face Value	176,254	139,842
Held-to-Maturity Securities, Amortized Cost Basis	186,504	140,890
Held-to-maturity Securities, Unrecognized Holding Loss	0	0
Held-to-maturity Securities, Fair Value	190,199	140,890
Held-to-maturity Securities	$ 186,504	$ 140,890

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Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investments in debt securities classified as held-to-maturity.

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Amount of unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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