Goodwill (Details) $ in Thousands		1 Months Ended	3 Months Ended			12 Months Ended
	Jul. 01, 2016 item	Dec. 31, 2014 item	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($) item
Goodwill.
Number of reporting units exceeding estimated fair values | item	1	2					2
Number of reporting Units | item	5					5	2
Goodwill impairment losses				$ 136,200			$ 136,200
Goodwill
Balance at the beginning of the period					$ 209,656	$ 64,073	209,656
Impairment charge			$ (19,000)	(51,200)	$ (85,100)	(18,998)	(136,248)
Business disposition							(6,733)
Translation adjustments						59	(2,602)
Balance at the end of the period			$ 45,134	$ 64,073		$ 45,134	$ 64,073