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Commitments and Contingencies Future minimum lease payments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Operating leases:
2013	$ 1,718us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2014	1,763us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2015	1,766us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2016	1,796us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2017	1,852us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter	6,908us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Liability	15,803us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Financing lease:
2013	1,124us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear
2014	1,165us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears
2015	1,255us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears
2016	1,348us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFourYears
2017	1,395us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsWithinFiveYears
Thereafter	3,697us-gaap_MinimumLeasePaymentsSaleLeasebackTransactionsThereafter
Total	9,984us-gaap_MinimumLeasePaymentsSaleLeasebackTransactions
Capital leases:
2013	39us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
2014	33us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
2015	27us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
2016	9us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
2017	0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter	0us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
Total	$ 108us-gaap_CapitalLeasesFutureMinimumPaymentsDue

X

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Amount of minimum lease payments for capital leases.

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