Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net (Detail Textuals)

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Property and Equipment, Net (Detail Textuals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Abstract]      
Depreciation and amortization expense $ 509,957 $ 432,495 $ 432,114
Repairs and maintenance expenses including Dry-docking expenses 157,200 155,400 124,800
Interest costs capitalized $ 29,000 $ 33,700 $ 31,900