Long-Term Debt (Maturities Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2013 Term Loan Maturing June 2018 [Member]		Dec. 31, 2013 MARAD Debt [Member]	Dec. 31, 2013 2032 Notes [Member]		Mar. 31, 2012 2032 Notes [Member]
Debt Instrument [Line Items]
Less than one year	$ 20,376			$ 15,000	[1]	$ 5,376
One to two years	28,144			22,500	[1]	5,644
Two to three years	35,926			30,000	[1]	5,926
Three to four years	36,222			30,000	[1]	6,222
Four to five years	201,532			195,000	[1]	6,532
Over five years	270,468					70,468	200,000	[2]
Total debt	592,668			292,500	[1]	100,168	200,000	[2]
Current maturities	(20,376)		(16,607)	(15,000)	[1]	(5,376)
Long-term debt, less current maturities	572,292			277,500	[1]	94,792	200,000	[2]
Unamortized debt discount	(26,516)	[3]	(31,688)				(26,516)	[2],[3]	(35,400)
Long-term debt	$ 545,776		$ 1,002,621	$ 277,500	[1]	$ 94,792	$ 173,484	[2]

[1] The amount reflects the borrowings made in July 2013 (see Credit Agreement discussion above).

[2] 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.

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