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Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Minimum annual payments under the non-cancelable leases
2013	$ 6,124
2014	6,206
2015	5,865
2016	5,027
2017	5,152
Thereafter	20,474
Total minimum lease payments	$ 48,848

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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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