Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Basis of Presentation and Significant Accounting Policies [Abstract]
Value added tax expense	$ 7,531	$ 5,147
Operating Income (Loss) [Member]
Basis of Presentation [Line Items]
Pretax Charge Resulting from Change in Estimate Related to Recoveries of Advances	$ 11,000