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Fair Value Measurements (Fair Value Of Long Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Jun. 30, 2013
Convertible Senior Notes (Matures March 2032) [Member]
Jun. 30, 2013
Senior Unsecured Notes [Member]
Jun. 30, 2013
MARAD Debt [Member]
Mar. 31, 2013
Helix Term Loan [Member]
Jun. 30, 2013
Loan Notes [Member]
Long-term debt, Fair Value   $ 251,500 [1],[2] $ 283,209 [2],[3] $ 114,371 [2]   $ 649,080 [2]
Long-term debt, Carrying Value   200,000 [1] 274,960 [3] 102,759 72,300 577,719
Unamortized debt discount $ 29,131 [4]          
[1] Carrying value excludes the related unamortized debt discount of $29.1 million at June 30, 2013.
[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] In June 2013, we elected to redeem the remaining Senior Unsecured Notes on July 22, 2013, and we redeemed these notes in full on that date.
[4] The Convertible Senior Notes due 2032 will increase to their principal amount through accretion of non-cash interest charges through March 2018.