Accounting for the Impairment or Disposal of Long-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Gain on property dispositions	$ 0	$ 46,115
Net income	0	47,848
Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenues	0	4,748
Operating expenses	0	(2,495)
Interest and other income	0	37
Interest expense	0	(557)
Depreciation and amortization	0	0
Income before gain on property dispositions	0	1,733
Gain on property dispositions	0	46,115
Net income	$ 0	$ 47,848

Discontinued Operations excluding Gain on Sale

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- Definition

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

Amount of depreciation and amortization attributable to disposal group.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of interest expense allocated to disposal group, including a discontinued operation.

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Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of other income attributable to disposal group.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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