Summary Of Significant Accounting Policies (Fair Value Of Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2012 Term Loan [Member]		Dec. 31, 2012 Revolving Credit Facility [Member]		Dec. 31, 2013 Term Loan Maturing June 2018 [Member]		Dec. 31, 2012 2025 Notes [Member]		Jan. 31, 2009 2025 Notes [Member]	Mar. 31, 2005 2025 Notes [Member]	Dec. 31, 2013 2032 Notes [Member]		Dec. 31, 2012 2032 Notes [Member]		Mar. 31, 2012 2032 Notes [Member]	Dec. 31, 2012 Senior Unsecured Notes [Member]		Dec. 31, 2013 MARAD Debt [Member]		Dec. 31, 2012 MARAD Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, Carrying Value	$ 592,668		$ 1,050,916		$ 367,181	[1]	$ 100,000	[1]	$ 292,500		$ 3,487	[2]		$ 300,000	$ 200,000	[3]	$ 200,000	[3]	$ 200,000	$ 274,960	[4]	$ 100,168		$ 105,288
Long-term debt, Fair Value	645,687	[5]	1,117,498	[5]	368,295	[1],[5]	100,000	[1],[5]	293,963	[5]	3,487	[2],[5]			242,250	[3],[5]	239,320	[3],[5]		283,209	[4],[5]	109,474	[5]	123,187	[5]
Unamortized debt discount	$ 26,516	[6]	$ 31,688										$ 60,200		$ 26,516	[6],[7]			$ 35,400

[1] Relates to the term loans and revolving credit facility under our former credit agreement, which was terminated in June 2013.

[2] This remaining amount was repurchased by us in February 2013.

[3] Carrying value excludes the related unamortized debt discount of $26.5 million at December 31, 2013.

[4] We redeemed our remaining Senior Unsecured Notes in July 2013.

[5] 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.

[6] The 2032 Notes will increase to their principal amount through accretion of non-cash interest charges through March 2018.

[7] Beginning in March 2018, the holders of the 2032 Notes may require us to repurchase these notes or we may at our option elect to repurchase notes. These notes will mature in March 2032.