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FAIR VALUE MEASUREMENTS
3 Months Ended
Mar. 31, 2019
FAIR VALUE MEASUREMENTS [Abstract]  
FAIR VALUE MEASUREMENTS
(7)
FAIR VALUE MEASUREMENTS

The estimated fair value of total debt outstanding at March 31, 2019 and December 31, 2018 was $1,676,480,000 and $1,411,628,000, respectively, which differs from the carrying amounts of $1,667,474,000 and $1,410,188,000, respectively, included in the consolidated financial statements. The fair value was determined using an income approach that relies on inputs such as yield curves which is a Level 2 fair value measurement. 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.