Restructuring - Summary of Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]
Charges to expense	$ 2,072	$ 7,132
Cash payments		(2,702)
Non-cash utilization		(2,018)
Balance at September 30, 2017	2,412	2,412
Employee Reduction [Member]
Restructuring Cost And Reserve [Line Items]
Charges to expense		2,868
Cash payments		(773)
Balance at September 30, 2017	2,095	2,095
Accelerated Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Charges to expense		2,018
Non-cash utilization		(2,018)
Other Exit Costs [Member]
Restructuring Cost And Reserve [Line Items]
Charges to expense		2,246
Cash payments		(1,929)
Balance at September 30, 2017	$ 317	$ 317