Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (28,796)	$ 18,184
Other comprehensive income (loss) before reclassifications	1,986	(609)
Amounts reclassified out of AOCI	127	8
Other comprehensive income (loss)	2,113	(601)
Balance at the end of the period	(26,683)	17,583
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Deferred Income Taxes Related to Other Comprehensive Income	0
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(12,132)	23,335
Other comprehensive income (loss) before reclassifications	5,865	(1,100)
Other comprehensive income (loss)	5,865	(1,100)
Balance at the end of the period	(6,267)	22,235
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(20,363)	(7,386)
Amounts reclassified out of AOCI	167	60
Other comprehensive income (loss)	167	60
Balance at the end of the period	(20,196)	(7,326)
Accumulated tax expense (benefit)	(2,300)	(2,200)
Post-Retirement Benefit Plans
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	1,159	1,464
Amounts reclassified out of AOCI	(40)	(52)
Other comprehensive income (loss)	(40)	(52)
Balance at the end of the period	1,119	1,412
Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	1,537	771
Other comprehensive income (loss) before reclassifications	(932)	491
Other comprehensive income (loss)	(932)	491
Balance at the end of the period	605	1,262
Forward Contracts [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	1,003
Other comprehensive income (loss) before reclassifications	(2,947)
Other comprehensive income (loss)	(2,947)	$ 0
Balance at the end of the period	$ (1,944)