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Income Tax Considerations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Required distribution percentage to maintain REIT status	90.00%
Fixed assets book value in excess of (less than) tax basis	$ 32.0	$ (88.0)
Current tax obligation	$ 1.5us-gaap_AccruedIncomeTaxes	$ 1.6us-gaap_AccruedIncomeTaxes

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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