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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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-Publisher FASB

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and Equipment - Additional Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Indefinite-lived Intangible Assets [Line Items]
Proceeds from sale of facility and related land									$ 0	$ 12,696,000	$ 0
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property									0us-gaap_GainLossOnDispositionOfAssets	4,775,000us-gaap_GainLossOnDispositionOfAssets	0us-gaap_GainLossOnDispositionOfAssets
Net carrying amount of capitalized software	17,000,000us-gaap_CapitalizedComputerSoftwareNet				13,900,000us-gaap_CapitalizedComputerSoftwareNet				17,000,000us-gaap_CapitalizedComputerSoftwareNet	13,900,000us-gaap_CapitalizedComputerSoftwareNet
Leasehold interests	487,899,000us-gaap_PropertyPlantAndEquipmentGross				457,944,000us-gaap_PropertyPlantAndEquipmentGross				487,899,000us-gaap_PropertyPlantAndEquipmentGross	457,944,000us-gaap_PropertyPlantAndEquipmentGross
Depreciation expense									28,100,000us-gaap_Depreciation	27,400,000us-gaap_Depreciation	30,000,000us-gaap_Depreciation
Asset Impairment Charges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	884,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	3,049,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	884,000us-gaap_AssetImpairmentCharges	3,049,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Leasehold Land Interests
Acquired Indefinite-lived Intangible Assets [Line Items]
Leasehold interests	9,100,000				10,000,000				9,100,000	10,000,000
Marketing and Events Group
Acquired Indefinite-lived Intangible Assets [Line Items]
Asset Impairment Charges									$ 900,000	$ 952,000