Comprehensive Income (Schedule of Changes in the Components of AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 11,076	$ 1,051
Other comprehensive income (loss) before reclassifications	(3,210)	29,310
Amounts reclassified from accumulated other comprehensive income (loss)	(10,948)	(18,694)
Net other comprehensive income (loss)	(14,158)	10,616	$ (5,884)
Purchase of shares from noncontrolling interest	(275)	(591)
Balance	(3,357)	11,076	1,051
Accumulated Net Unrealized Investment Gain (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	14,537	(528)
Other comprehensive income (loss) before reclassifications	(3,241)	33,759
Amounts reclassified from accumulated other comprehensive income (loss)	(10,948)	(18,694)
Net other comprehensive income (loss)	(14,189)	15,065
Purchase of shares from noncontrolling interest	0	0
Balance	348	14,537	(528)
Accumulated Defined Benefit Plans Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	13	140
Other comprehensive income (loss) before reclassifications	31	(127)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	31	(127)
Purchase of shares from noncontrolling interest	0	0
Balance	44	13	140
Accumulated Translation Adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(3,474)	1,439
Other comprehensive income (loss) before reclassifications	0	(4,322)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	0	(4,322)
Purchase of shares from noncontrolling interest	(275)	(591)
Balance	$ (3,749)	$ (3,474)	$ 1,439