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Lease Exit Liability (Tables)
3 Months Ended
Mar. 31, 2016
Lease Exit Liability [Abstract]  
Changes in Lease Exit Liability
Changes in the lease exit liability are as follows (in thousands):

Accrual balance at December 31, 2015
 
$
4,713
 
Principal payments
  
(488
)
Accrual balance at March 31, 2016
 
$
4,225