Restructuring and Asset Impairment Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Restructuring Reserve [Roll Forward]
Beginning balance				$ 397		$ 397	$ 668	$ 1,960
Employee separation charges						8,612	2,275	(55)
Other cash charges						6	0	0
Total employee separation and other cash charges						8,618	2,275	(55)
Payments through March 31						(928)	(2,546)	(1,237)
Ending balance	8,087				397	8,087	397	668
Asset impairment and other non-cash charges					819	500	2,836	0
Total restructuring and asset impairment charges	$ 8,618	$ 0	$ 500	$ 0		$ 9,118	$ 5,111	$ (55)