Commitments and Contingencies - Expected Future Non-cancelable Sublease Proceeds (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
2013	$ 1,742
2014	1,530
2015	1,539
2016	1,276
Future Minimum Sublease Rentals, Operating Leases, Due in Five Years	1,223
Thereafter	1,936
Total sublease proceeds	$ 9,246

Future Minimum Sublease Rentals, Operating Leases, Due in Five Years

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Future Minimum Sublease Rentals, Operating Leases, Due in Four Years

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Future Minimum Sublease Rentals, Operating Leases, Due in Three Years

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Future Minimum Sublease Rentals, Operating Leases, Due in Two Years

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Future Minimum Sublease Rentals, Operating Leases, Due Thereafter

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Future Minimum Sublease Rentals, Operating Leases, Due Total

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Future Minimum Sublease Rentals, Operating Leases, Next Twelve Months

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