Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 7,484	$ 5,029	$ 109,144
Adjustments to reconcile net income to cash flows provided by operating activities:
Depreciation	7,678	8,941	9,650
Amortization	1,200	1,642	2,982
Amortization of loan costs	$ 880	$ 936	1,071
Amortization of notes payable premium			(31)
Provision for deferred income taxes	$ 1,882	$ 2,692	$ 6,157
Excess tax benefit from stock-based compensation	144	249
Provision for uncollectible accounts receivable	442	476	$ 418
Stock-based compensation	362	643
Changes in operating assets and liabilities
Accounts receivable	(11)	(128)	$ 3,442
Material and supplies	9	(261)	191
Prepaid expenses and other assets	878	(1,486)	44
Accounts payable and accrued expenses	227	(534)	334
Advance billings and payments	(45)	(67)	(191)
Other liabilities	$ (117)	$ (10)	(351)
Reorganization adjustments:
Non-cash reorganization income			(114,210)
Net cash from operating activities	$ 21,013	$ 18,122	18,650
Cash flows used in investing activities:
Acquisition and construction of property and equipment	$ (6,612)	(6,015)	$ (6,229)
Proceeds from sale of property and equipment		58
Purchase of investment		(1)
Purchase of Reliable Networks, net of cash acquired		(500)
Net cash used in investing activities	$ (6,612)	(6,458)	$ (6,229)
Cash flows used in financing activities:
Principal repayment of long-term notes payable	(12,083)	$ (16,498)	(33,368)
Loan origination costs	(516)		(1,653)
Net cash used in financing activities	(12,599)	$ (16,498)	(35,021)
Net increase (decrease) in cash and cash equivalents	1,802	(4,834)	(22,600)
Cash and cash equivalents, beginning of period	5,082	9,916	32,516
Cash and cash equivalents, end of period	6,884	5,082	9,916
Supplemental disclosures of cash flow information:
Interest paid	7,016	7,924	8,581
Income taxes paid	$ 2,414	$ 1,535	248
Loan fees paid via issuance of Class B common stock			2,772
Cancellation of Class A common stock			132
Issuance of Class A common stock	$ 1		$ 29