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Components of Interest Expense (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Interest expense, borrowings: |  |  |  |
Interest expense | $ 16,540 | $ 16,009 | $ 48,715 | $ 47,888
Capitalized interest | (119) | (76) | (290) | (154)
Amortization of transaction costs | 1,014 | 1,198 | 3,149 | 3,292
Interest expense resulting from derivatives | 4,641 | 5,613 | 16,106 | 17,314
Total interest expense | $ 22,076 | $ 22,744 | $ 67,680 | $ 68,340

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