Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Line Items]
Federal statutory income tax rate	35.00%	35.00%
Effective income tax rate	36.00%
Consolidated income tax expense (benefit)	$ (3,432)	$ (12,038)
Effective Income Tax Rate Reconciliation excluding European Commission fine [Member]
Income Tax Disclosure [Line Items]
Effective income tax rate		35.00%
Deltafina [Member]
Income Tax Disclosure [Line Items]
Consolidated income tax expense (benefit)		$ 8,000