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Borrowings - Remaining Maturities of Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Debt Instrument [Line Items]
Less than 1 year	$ 156,969
1 to 3 years	3
3 to 5 years	70,195
More than 5 years
Total	227,167
Wells Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year	156,969	[1]
1 to 3 years		[1]
3 to 5 years		[1]
More than 5 years		[1]
Total	156,969	[1]
UBS Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year		[1]
1 to 3 years		[1]
3 to 5 years	70,195	[1]
More than 5 years		[1]
Total	70,195	[1]
JPMorgan Facility borrowings [Member]
Debt Instrument [Line Items]
Less than 1 year
1 to 3 years	3
3 to 5 years
More than 5 years
Total	$ 3
[1] Assumes extension options are exercised.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth and fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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