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Lease Exit Liability (Tables)
12 Months Ended
Dec. 31, 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, 2015
$
4,713

Principal payments and other adjustments
(2,822
)
Accrual balance at December 31, 2016
1,891

Principal payments and other adjustments (net of sublease receipts)
(1,593
)
Accrual balance at December 31, 2017
$
298