Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities:
Net income	$ 209	$ 5,471
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,879	16,984
(Gain) loss on disposal of assets, net	(97)	41
Amortization of debt issuance costs and debt discount	606	689
Loss on extinguishment of debt	2,830
Amortization of deferred capacity revenue	(2,259)	(1,930)
Stock-based compensation	489	567
Income tax expense	144	1,306
Charge for uncollectible accounts	(32)	1,092
Amortization of right-of-use assets	1,148
Other non-cash expense, net	244	181
Income taxes receivable		(36)
Changes in operating assets and liabilities	7,172	(2,007)
Net cash provided by operating activities	28,333	22,358
Cash Flows from Investing Activities:
Capital expenditures	(20,432)	(17,081)
Capitalized interest	(609)	(891)
Change in unsettled capital expenditures	(551)	(1,632)
Proceeds on sale of assets	19
Net cash used by investing activities	(21,573)	(19,604)
Cash Flows from Financing Activities:
Repayments of long-term debt	(171,768)	(20,506)
Proceeds from the issuance of long-term debt	180,000	14,000
Debt issuance costs and discounts	(2,683)
Cash paid for debt extinguishment	(1,252)
Cash proceeds from noncontrolling interest		40
Payment of withholding taxes on stock-based compensation	(448)	(410)
Purchases of treasury stock	(149)
Proceeds from the issuance of common stock	106	111
Net cash provided (used) by financing activities	3,806	(6,765)
Change in cash, cash equivalents and restricted cash	10,566	(4,011)
Cash, cash equivalents and restricted cash, beginning of period	14,985	16,168
Cash, cash equivalents and restricted cash, end of period	25,551	12,157
Supplemental Cash Flow Data:
Interest paid	6,114	7,251
Income taxes paid, net	$ 10	$ 4