Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Instruments [Abstract]

Components of Long-Term Debt

Long-term debt consisted of the following:

		March 31, 2018				December 31, 2017
(Dollar amounts in thousands)	Maturity Date	Amount Outstanding			Interest Rate	Amount Outstanding			Interest Rate
TDC
Senior secured notes - $25.0 million	December 30, 2020	$	15,938		8.50%	$	16,250		8.50%
SDTS
Senior secured notes - $60.0 million	June 20, 2018		60,000		5.04%		60,000		5.04%
Senior secured term loan - $200.0 million	June 5, 2020		200,000		3.04%		200,000		2.71%
Senior secured notes - $400.0 million	December 3, 2025		400,000		3.86%		400,000		3.86%
Senior secured notes - $100.0 million	January 14, 2026		100,000		3.86%		100,000		3.86%
Senior secured notes - $53.5 million	December 30, 2029		40,009		7.25%		40,546		7.25%
Senior secured notes - $110.0 million	September 30, 2030		91,638		6.47%		92,821		6.47%
Total SDTS debt			891,647				893,367
Total long-term debt			907,585				909,617
Less unamortized deferred financing costs			(89	)			(97	)
Total long-term debt, less deferred     financing costs			907,496				909,520
Less current portion of long-term debt			(67,847	)			(68,305	)
Debt classified as long-term debt, less     deferred financing costs		$	839,649			$	841,215