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Commitments and Contingencies - Summary of Rental Expense (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of rental expense charged to operations
Rental expense	$ 2,250	$ 2,169	$ 2,024
Sublease rental income	(396)	(371)	(424)
Net rental expense	$ 1,854	$ 1,798	$ 1,600

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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