SCHEDULE IV - MORTGAGE LOANS ON REAL ESTATE (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 3,502,000us-gaap_MortgageLoansOnRealEstate	$ 0us-gaap_MortgageLoansOnRealEstate	$ 1,500,000us-gaap_MortgageLoansOnRealEstate
Additions: [Abstract]
New mortgage loan	47,000,000	3,523,000	0
Deductions: [Abstract]
Mortgage loan payments through deed in lieu of foreclosure	(47,000,000)	0	0
Mortgage loan payments	(85,000)	(21,000)	(1,500,000)
Balance at end of year	3,417,000us-gaap_MortgageLoansOnRealEstate	3,502,000us-gaap_MortgageLoansOnRealEstate	0us-gaap_MortgageLoansOnRealEstate
US Airways Building
Mortgage Loans on Real Estate [Line Items]
Interest Rate (in percent)	3.00%
Final Maturity Date	Dec. 01, 2016
Periodic Payment Term	Principal and interest
Prior Liens	0
Face Amount of Mortgage	3,545,000
Cost for federal tax purposes	3,417,000
Principal Amount of Loan Subject to Delinquent Principal and Interest	$ 0

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Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

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Total carrying amount of mortgage loans as of the balance sheet date.

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Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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Amount of the federal income tax basis of mortgage loans on real estate.

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The amount of mortgage loans on real estate which were foreclosed on during the reporting period.

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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Total amount of new mortgage loans on real estate during the reporting period.

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The amount of reductions in principal on mortgage loans other than foreclosures, costs of mortgages sold, and amortization of premium during the reporting period.

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Description of the contractual payment terms of the loan receivable including whether principal and interest is payable at a level or varying amount over the life of the loan, the amount of any balloon payment required at maturity, and any prepayment penalties.

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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

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Amount of prior lien on the real estate that secures the mortgage loan.

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