Restructuring and Asset Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning balance				$ 8,087				$ 397	$ 8,087	$ 397	$ 668
Employee separation charges (recoveries)									(498)	8,612	2,275
Other cash charges									662	6	0
Total employee separation and other cash charges									164	8,618	2,275
Payments									(7,853)	(928)	(2,546)
Ending balance March 31	$ 398				$ 8,087				398	8,087	397
Asset impairment and other non-cash charges									5,724	500	2,836
Total restructuring and asset impairment charges	$ 1,801	$ 1,525	$ (386)	$ 2,948	$ 8,618	$ 0	$ 500	$ 0	$ 5,888	$ 9,118	$ 5,111