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FAIR VALUE MEASUREMENTS
9 Months Ended
Sep. 30, 2017
FAIR VALUE MEASUREMENTS [Abstract]  
FAIR VALUE MEASUREMENTS
(5)
FAIR VALUE MEASUREMENTS

The estimated fair value of total debt outstanding at September 30, 2017 and December 31, 2016 was $1,025,773,000 and $715,330,000, respectively, which differs from the carrying amounts of $1,033,428,000 and $722,802,000, 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 nine months ended September 30, 2017, there was no indication that the Company’s long-lived assets were impaired, and accordingly, measurement at fair value was not required.