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Operating Leases Future Minimum Payments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
2013	$ 31,839
2014	25,694
2015	19,535
2016	12,312
2017	5,646
Thereafter	11,739
Total	106,765
Rent expense on operating leases	$ 33,594	$ 28,008	$ 23,535

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