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Commitments (Tables)
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Future minimum annual lease payments under capital and operating leases
 
Capital
Leases
 
Operating
Leases
2014
$
580

 
$
8,668

2015
146

 
8,280

2016
127

 
8,347

2017
—

 
8,220

2018
—

 
8,021

Thereafter
—

 
33,698

Total minimum lease payments
853

 
$
75,234

Less amount representing interest, 14.6% weighted average interest rate
(105
)
 
 
Present value of obligations under capital leases
748

 
 
Less current portion
(525
)
 
 
Long-term capital lease obligations
$
223