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Restructuring Expenses (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Activity related to the restructuring liability
The restructuring charge and other activities related to this restructuring event recorded during the year ended December 31, 2017 were as follows:
 
2017
 
(in thousands)

Liability, beginning of the period
$
—

Restructuring expense
12,503

Cash payments
(8,602
)
Asset impairments and other non-cash items
(1,812
)
Liability, end of the period
$
2,089