Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Instruments [Abstract]

Components of Long-Term Debt

Long-term debt consisted of the following:

		December 31, 2016					December 31, 2015
(In thousands)	Maturity Date	Amount Outstanding			Interest Rate		Amount Outstanding			Interest Rate
TDC
Senior secured notes - $25.0 million	December 30, 2020	$	17,500			8.50%	$	18,750			8.50%
SDTS
Senior secured notes - $60.0 million	June 20, 2018		60,000			5.04%		60,000			5.04%
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%		—		N/A
Senior secured notes - $53.5 million	December 30, 2029		42,600			7.25%		44,512			7.25%
Senior secured notes - $110.0 million	September 30, 2030		97,366			6.47%		101,627			6.47%
Total SDTS debt			699,966					606,139
Total long-term debt			717,466					624,889
Less unamortized deferred financing costs			(129	)				(161	)
Total long-term debt, less deferred     financing costs			717,337					624,728
Less current portion of long-term debt			(7,849	)				(7,423	)
Debt classified as long-term debt, less     deferred financing costs		$	709,488				$	617,305

Schedule of Future Maturities of Long-Term Debt

Future maturities of long-term debt are as follows for the years ending December 31:

(In thousands)	Total
2017	$	7,849
2018		68,305
2019		8,792
2020		21,813
2021		8,621
Thereafter		602,086
Total	$	717,466