Details Of Certain Accounts - Other Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Note receivable, net	$ 3,758		$ 2,827
Prepaids	7,666		6,418
Deferred dry dock costs, net (Note 2)	12,368		14,766
Deferred costs	63,767		30,738
Charter fee deposit	12,544		12,544
Other	5,102		5,256
Total other assets, net	$ 105,205		72,549
Redeemable convertible bonds, face amount		$ 4,300
Noncurrent note receivable, interest rate (as a percent)	5.00%
Allowance for note receivable			$ 4,200