Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Intangible assets
Estimated Fair Value	$ 131,811
Monthly Amortization	1,169
Superior Trade Names [Member]
Intangible assets
Estimated Fair Value	88,767
Monthly Amortization	740
Estimated Useful Life	10 years
Technology [Member]
Intangible assets
Estimated Fair Value	5,294
Monthly Amortization	88
Estimated Useful Life	5 years
Employment Contracts and Non Compete Agreements [Member]
Intangible assets
Estimated Fair Value	675
Monthly Amortization	33
Estimated Useful Life	1-3 years
Customer Relationships [Member]
Intangible assets
Estimated Fair Value	37,075
Monthly Amortization	$ 308
Estimated Useful Life	10 years

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant