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Other Debt - Secured Term Loan Borrowings and Collateral (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Debt Instrument [Line Items]
Borrowings	$ 3,595,325us-gaap_LongTermDebt
Secured Debt [Member] \| Secured Term Loan [Member]
Debt Instrument [Line Items]
Borrowings	45,324
Collateral Carrying Value	77,934
Secured Debt [Member] \| Loans Held For Investment [Member]
Debt Instrument [Line Items]
Borrowings	12,453
Collateral Carrying Value	23,103
Secured Debt [Member] \| Intercompany Mortgage Loans [Member]
Debt Instrument [Line Items]
Borrowings	3,903
Collateral Carrying Value	11,207
Secured Debt [Member] \| Commercial Mortgage Backed Securities [Member]
Debt Instrument [Line Items]
Borrowings	28,968
Collateral Carrying Value	$ 43,624

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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