Summary of Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Estimated Payments under Self-insurance Program
2012	$ 14,382
2013	8,371
2014	5,703
2015	3,856
2016	$ 2,737

Estimated payments under self insurance program year three.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant