Restructuring (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Charges		$ 1,780
Goodwill impairment		37,120	$ 0	$ 0
SND Plan
Restructuring Cost and Reserve [Line Items]
Charges	$ 21,163
Goodwill impairment	17,795
Other Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Charges		3,762
Severance and Employee Benefit Costs
Restructuring Cost and Reserve [Line Items]
Charges		1,466
Severance and Employee Benefit Costs | SND Plan
Restructuring Cost and Reserve [Line Items]
Charges	202
Severance and Employee Benefit Costs | Other Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Charges		1,264
Non-cash asset related costs | SND Plan
Restructuring Cost and Reserve [Line Items]
Charges	2,852
Non-cash asset related costs | Other Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Charges		2,498
Contract Cancellations
Restructuring Cost and Reserve [Line Items]
Charges		$ 314
Contract Cancellations | SND Plan
Restructuring Cost and Reserve [Line Items]
Charges	$ 314