Restructuring Activities and Other Charges - Narrative (Details) $ in Thousands	5 Months Ended	12 Months Ended			37 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) employee	Dec. 14, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,349	$ 1,349	$ 0		$ 1,349
Expected number of positions to eliminate (in employee) | employee					100
Expected restructuring cost						$ 6,700
Restructuring charges		(6,031)	0	$ (5,615)
Cash payments		(4,377)
Employee Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	358	358	0		$ 358
Expected restructuring cost						5,600
Restructuring charges		(3,257)
Cash payments		(2,594)
Lease and Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	286	286	0		286
Restructuring charges		(512)
Cash payments		(226)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	705	705	$ 0		$ 705
Restructuring charges		(2,262)
Cash payments		$ (1,557)
Maximum | Lease and Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost						$ 1,100
Restructuring Plan, 2018 [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash settlements / adjustments	400
Restructuring Plan, 2018 [Member] | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(20,000)
Restructuring Plan, 2018 [Member] | Minimum | Employee Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(12,000)
Restructuring Plan, 2018 [Member] | Minimum | Lease and Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(8,000)
Restructuring Plan, 2018 [Member] | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(25,000)
Restructuring Plan, 2018 [Member] | Maximum | Employee Severance and Related Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(15,000)
Restructuring Plan, 2018 [Member] | Maximum | Lease and Contract Termination Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (10,000)