Income Taxes (Deferred Tax Assets and Liabilities by Balance Sheet Grouping) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred income tax asset, net	$ 57,961	$ 53,562
Non-current deferred income tax liability, net	(825,897)	(825,612)
Net deferred tax liability	$ (767,936)	$ (772,050)