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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Non-trade accounts receivable $ 7,058 $ 7,998
Accumulated depreciation on vessel and equipment 666,710 588,735
Accumulated depreciation on vessels under capital leases $ 56,316 $ 50,898