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Property and Equipment (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Property and equipment
Property and equipment	$ 193,419	$ 148,426
Less accumulated depreciation and amortization	(31,887)	(24,427)
Property and equipment, net	161,532	123,999
Land [Member]
Property and equipment
Property and equipment	8,282	8,282
Land improvements [Member]
Property and equipment
Property and equipment	1,597	1,597
Buildings [Member]
Property and equipment
Property and equipment	51,044	48,323
Equipment under capital leases [Member]
Property and equipment
Property and equipment	4,502	4,502
Leasehold improvements and other [Member]
Property and equipment
Property and equipment	13,501	11,407
Computer equipment [Member]
Property and equipment
Property and equipment	40,166	36,742
Furniture, fixtures and equipment [Member]
Property and equipment
Property and equipment	12,368	11,401
Internally Developed Software [Member]
Property and equipment
Property and equipment	5,467	3,825
Other [Member]
Property and equipment
Property and equipment	1,098	998
Construction in progress [Member]
Property and equipment
Property and equipment	$ 55,394	$ 21,349

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.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

-Subparagraph c



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, construction in progress, and similar items. Amount does not include depreciation.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 5

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, and production equipment.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 12

-Paragraph 5

-Subparagraph b, c



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

+ Details

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Balance Type:	debit
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