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Commitments and Contingencies Future minimum lease payments for financing obligations (Tables)
12 Months Ended
Dec. 31, 2012
Leases [Abstract]  
Capital leases of Lessee [Table Text Block]
As of December 31, 2012, the future minimum lease payments for the lease financing obligations were as follows (in thousands):
2013
$
3,254

2014
 
3,328

2015
 
3,410

2016
 
3,493

2017
 
3,615

2018 and thereafter
 
8,278

Total payments
$
25,378

Amount representing interest
 
(5,186
)
Present value of future minimum lease payments
$
20,192

Lease financing obligations classified as current
$
2,056

Lease financing obligations classified as long-term
$
18,136