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Commitments and Contingencies Future minimum lease payments for financing obligations (Tables)
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Capital leases of Lessee [Table Text Block]
As of December 31, 2014, the future minimum lease payments for these lease financing obligations were as follows (in thousands):
2015
$
3,411

2016
 
3,486

2017
 
3,604

2018
 
3,735

2019
 
4,196

2020
 
651

Total payments
$
19,083

Amount representing interest
 
(2,962
)
Present value of future minimum lease payments
$
16,121

Lease financing obligations classified as current
$
2,459

Lease financing obligations classified as long-term
$
13,662