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FAIR VALUE MEASUREMENTS
6 Months Ended
Jun. 30, 2018
FAIR VALUE MEASUREMENTS [Abstract]  
FAIR VALUE MEASUREMENTS
(6)
FAIR VALUE MEASUREMENTS

The estimated fair value of total debt outstanding at June 30, 2018 and December 31, 2017 was $1,432,646,000 and $984,017,000, respectively, which differs from the carrying amounts of $1,442,530,000 and $992,406,000, respectively, included in the consolidated financial statements. The fair value was determined using an income approach that relies on inputs such as yield curves. Cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying values that approximate fair value due to the short-term maturity of these financial instruments.
 
Certain assets are measured at fair value on a nonrecurring basis. These assets are adjusted to fair value when there is evidence of impairment. During the 2017 fourth quarter, the Company reduced certain vessels to fair value due to its decision to put certain older out-of-service vessels up for sale in its marine transportation segment. The fair value of these vessels is $8,800,000 and $12,550,000 at June 30, 2018 and December 31, 2017, respectively, and is presented in prepaid expenses and other current assets.