Property and Equipment Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation	$ 8,716	$ 6,157	$ 6,156
Furniture and Fixtures, Gross	43,258	39,416
Leasehold Improvements, Gross	30,852	20,604
Capitalized Computer Software, Gross	15,350	6,128
Property, Plant and Equipment, Gross	89,460	66,148
Accumulated depreciation on property and equipment	(39,534)	(32,516)
Property and equipment (net of accumulated depreciation of $39,534 and $32,516 at December 31, 2012 and 2011, respectively)	$ 49,926	$ 33,632

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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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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- Definition

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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