Summary Of Significant Accounting Policies (Fair Value Of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2009	Dec. 31, 2011 Term Loan [Member]		Dec. 31, 2010 Term Loan [Member]		Dec. 31, 2011 Revolving Credit Facility [Member]	Dec. 31, 2010 Revolving Credit Facility [Member]	Dec. 31, 2011 Convertible Senior Notes [Member]		Dec. 31, 2010 Convertible Senior Notes [Member]		Mar. 31, 2005 Convertible Senior Notes [Member]	Dec. 31, 2011 Senior Unsecured Notes [Member]		Dec. 31, 2010 Senior Unsecured Notes [Member]		Dec. 31, 2011 MARAD Debt [Member]		Dec. 31, 2010 MARAD Debt [Member]		Dec. 31, 2010 Loan Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, carrying value	$ 1,164,876	$ 1,376,460		$ 279,750	[1]	$ 410,441	[1]			$ 300,000	[1],[2]	$ 300,000	[1],[2]	$ 300,000	$ 474,960	[1]	$ 550,000	[1]	$ 110,166	[3]	$ 114,811	[3]	$ 1,208
Long-term debt, Fair Value	1,205,864	1,386,737		279,750	[1]	406,337	[1]			300,543	[1],[2]	289,158	[1],[2]		501,083	[1]	567,875	[1]	124,488	[3]	122,159	[3]	1,208
Unamortized debt discount	$ 9,555		$ 60,200							$ 9,555	[4]	$ 18,500

[1] The fair values of these instruments were based on quoted market prices as of December 31, 2011 and 2010. The fair values were estimated using level 1 inputs using the market approach.

[2] Carrying amounts exclude the $9.6 million and $18.5 million of unamortized discount on the Convertible Senior Notes at December 31, 2011 and 2010, respectively.

[3] The fair value of the MARAD debt was determined by a third-party evaluation of the remaining average life and outstanding principal balance of the MARAD indebtedness as compared to other government guaranteed obligations in the market place with similar terms. The fair value of the MARAD debt was estimated using Level 2 fair value inputs using the market approach.

[4] Beginning in December 2012, we may at our option repurchase the notes or the holders may require us to repurchase the notes. The notes will increase to the $300 million face amount through accretion of non-cash interest charges through December 2012.