Restructuring Costs Restructuring costs (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended
	Sep. 30, 2015		Jun. 30, 2015	Sep. 30, 2014	[1]	Sep. 30, 2015		Sep. 30, 2014	[1]
Restructuring Costs [Line Items]
Restructuring and impairment costs	$ 0	[1]	$ 2,400	$ 3,350		$ 2,389	[1]	$ 3,350
Restructuring liability	$ 1,600					$ 1,600

[1] Restructuring and impairment costs are excluded from segment operating income, but are included in consolidated operating income in the consolidated statements of income and comprehensive income.