Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended		24 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 1,418	$ 152	$ 1,795	$ 1,673	$ 3,836	$ 403	$ 5,038	$ 4,239	$ 9,277
Severance and related charges
Restructuring Cost and Reserve [Line Items]
Restructuring expense							3,041	$ 4,239	7,280
Facility relocation and closure charges
Restructuring Cost and Reserve [Line Items]
Restructuring expense							$ 1,996		$ 1,996