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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2019
Restructuring and Related Activities [Abstract]  
Changes in Restructuring Liability Changes to this liability during the year ended December 31, 2019 were as follows (in thousands):
Liability balance as of January 1, 2018
$
—

Expenses
6,055

Cash distributions
(448
)
Liability balance as of December 31, 2018
5,607

Expenses
8,543

Cash distributions
(10,589
)
Liability balance as of December 31, 2019
$
3,561