Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Minimum future payments for all capital and operating leases
2013, Capital Leases	$ 1,012
2013, Operating Leases	4,536
2014, Capital Leases	608
2014, Operating Leases	4,169
2015, Capital Leases
2015, Operating Leases	4,001
2016, Capital Leases
2016, Operating Leases	3,943
2017, Capital Leases
2017, Operating Leases	3,968
Thereafter, Capital Leases
Thereafter, Operating Leases	25,909
Capital Leases, Total	1,620
Operating Leases, Total	46,526
Less executory costs	(1,234)
Net minimum lease payments	386
Less amounts representing interest	(25)
Present value of net minimum lease payments	361
Less current portion of obligations under capital leases	211
Long-term portion of obligations under capital leases	$ 150

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.