Corporate Restructuring - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring costs	$ 22	$ 34	$ 7,590
Payments	(438)	(463)	(6,241)
Restructuring Liability	504
Severance and Other Employee Costs
Restructuring and Related Activities [Abstract]
Restructuring costs	22	29	7,515
Payments	(438)	(458)	(6,166)
Restructuring Liability	$ 504
Other Costs
Restructuring and Related Activities [Abstract]
Restructuring costs		5	75
Payments		$ (5)	$ (75)