Long-Term Debt and Capital Leases (Capital Lease Agreements) (Details) (Capital Lease Obligations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Vehicles [Member]
Description of lessee leasing arrangements, capital leases	The Company assumed certain vehicle capital leases in the CSK acquisition. The remaining vehicle capital lease agreements have contractual terms of 63 months, which will expire on October 15, 2013.
Present value of future minimum capital lease payments, classified as long-term debt	$ 0.7	$ 1.9
Building [Member]
Description of lessee leasing arrangements, capital leases	The Company assumed certain building capital leases in the CSK acquisition. The remaining building capital lease agreements will expire on April 30, 2015, and March 31, 2017.
Present value of future minimum capital lease payments, classified as long-term debt	$ 0.5	$ 0.8

A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

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-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.

+ Details