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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Schedule of minimum rental commitments
2013	$ 39,992
2014	39,925
2015	37,203
2016	32,433
2017	26,960
Thereafter	65,916
Total	$ 242,429

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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