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FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2019

Marketable securities

Schedule of carrying amounts and fair values of assets and liabilities

The amortized cost and fair values of our marketable securities are as follows (dollars in thousands):


		December 31, 2019						December 31, 2018
					Estimated						Estimated
		Cost			Fair Value			Cost			Fair Value
Marketable securities		$	715		$	654		$	818		$	712

Schedule of carrying amounts and fair values of assets and liabilities

The principal amounts and fair values of our debt are as follows (dollars in thousands):


		December 31, 2019						December 31, 2018
		Principal			Estimated			Principal			Estimated
		Amount			Fair Value			Amount			Fair Value
Total debt		$	3,166,472		$	3,608,341		$	3,227,663		$	3,421,753