Restructuring, Asset Impairment, and Transition Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Reconciliation of Accrued Restructuring Costs

The following table is a reconciliation of the accrued restructuring costs between January 1, 2016 and December 31, 2018.

	2015 Plan			2017 Plan			Total
Balance at January 1, 2016	$	2,211		$	—		$	2,211
Restructuring expense incurred		9,849			—			9,849
Non-cash loss on impairment of fixed assets		(1,521	)		—			(1,521	)
Cash payments		(8,568	)		—			(8,568	)
Balance at December 31, 2016		1,971			—			1,971
Restructuring expense incurred		3,491			652			4,143
Cash payments		(4,662	)		(444	)		(5,106	)
Balance at December 31, 2017		800			208			1,008
Restructuring expense incurred		284			4,165			4,449
Cash payments		(679	)		(2,803	)		(3,482	)
Balance at December 31, 2018	$	405		$	1,570		$	1,975