Property and Equipment - Components of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Aircraft	$ 17,844	$ 17,651
Equipment	18,175	16,306
Furniture and fixtures	7,578	8,131
Leasehold improvements	25,567	24,100
Property, Plant and Equipment, Gross, Total	69,164	66,188
Less accumulated depreciation and amortization	(54,760)	(50,193)
Total property and equipment, net	$ 14,404	$ 15,995

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived 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, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived 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, furniture and fixtures, and computer equipment.

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