v2.4.0.8

Summary of Significant Accounting Policies Schedule of Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		$ 698,708	$ 582,197
Less—Accumulated depreciation		(231,130)	(179,950)
Construction in progress		26,801	21,851
Property, Plant and Equipment, Net	531,897	494,379	424,098	331,312
Land and improvements
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		87,720	81,170
Buildings and improvements
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		133,368	119,414
Furniture, fixtures and equipment
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		243,565	192,514
Computer equipment and software
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		91,588	79,195
Vehicles and trailers
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		51,187	40,825
Leasehold improvements
Property, Plant and Equipment
Property and equipment excluding construction in progress, gross		$ 91,280	$ 69,079

X

- Definition

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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- Definition

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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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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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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