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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Nov. 09, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments and Contingencies [Abstract]
Lease expiration date, maximum			Through 2020
Rent expense		$ 17,375	$ 16,215	$ 14,809
Minimum rentals for aggregate lease commitments [Abstract]
2012		7,937
2013		4,628
2014		2,811
2015		1,622
2016		774
Thereafter		857
Total		18,629
Aggregate residual value at lease expiration for vehicle leases		8,000
Guaranteed aggregate residual value at lease expiration for vehicle leases		6,208
Liability for the estimated end-of-term loss related to residual value guarantee		895
Minimum purchase obligation	$ 1,580,000	$ 0

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- Definition

The aggregate residual value at lease expiration for vehicle leases.

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Estimated end-of-term loss related to residual value guarantee as of Balance Sheet date.

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No definition available.

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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- Definition

The date upon which a lease or a group of leases is set to expire.

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No definition available.

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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- Definition

The total of future contractually required payments on leases defined as operating.

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- Definition

For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the fifth year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the third year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within the second year of the balance sheet date relating to leases defined as operating.

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For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due after the fifth year from the balance sheet date on leases defined as operating.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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