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Lease Exit Liability (Tables)
9 Months Ended
Sep. 30, 2017
Restructuring and Related Activities [Abstract]  
Changes in Lease Exit Liability
Changes in the lease exit liability are as follows (in thousands):
Accrual balance at December 31, 2016
$
1,891

Principal payments
(1,176
)
Accrual balance at September 30, 2017
$
715