Restructuring and Asset Impairment Charges (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning balance				$ 398				$ 8,087	$ 398	$ 8,087	$ 397
Employee separation charges (recoveries)									517	(498)	8,612
Other cash charges									120	662	6
Total employee separation and other cash charges									637	164	8,618
Payments									(846)	(7,853)	(928)
Ending balance March 31	$ 189				$ 398				189	398	8,087
Asset impairment and other non-cash charges									738	5,724	500
Total restructuring and asset impairment charges	$ 307	$ 450	$ 577	$ 41	$ 1,801	$ 1,525	$ (386)	$ 2,948	$ 1,375	$ 5,888	$ 9,118