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Fair Value Measurements (Fair Value Of Long Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, carrying value $ 586,263
Unamortized debt discount 25,119 [1]
Term Loan Maturing June 2018 [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, carrying value 288,750
Long-term debt, Fair Value 288,750 [2]
Convertible Senior Notes (Matures March 2032) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, carrying value 200,000 [3]
Long-term debt, Fair Value 247,460 [2],[3]
MARAD Debt [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, carrying value 97,513
Long-term debt, Fair Value 107,021 [2]
Loan Notes [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Long-term debt, carrying value 586,263
Long-term debt, Fair Value $ 643,231 [2]
[1] The Convertible Senior Notes due 2032 will increase to their principal amount through accretion of non-cash interest charges through March 2018.
[2] The estimated fair value of all debt, other than the MARAD Debt, was determined using Level 1 inputs using the market approach. The fair value of the MARAD Debt was determined using a third party evaluation of the remaining average life and outstanding principal balance of the MARAD indebtedness as compared to other governmental obligations in the marketplace with similar terms. The fair value of the MARAD Debt was estimated using Level 2 fair value inputs using the market approach.
[3] Carrying value excludes the related unamortized debt discount of $25.1 million at March 31, 2014.