Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 4,835	$ 8,988
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,276	33,908
Loss on the disposal of assets, net	156	125
Amortization of debt issuance costs and debt discount	1,215	1,353
Loss on extinguishment of debt	2,830
Amortization of deferred capacity revenue	(4,655)	(4,098)
Stock-based compensation	1,580	1,757
Deferred income tax expense	2,919	2,767
Charge for uncollectible accounts	257	2,745
Other non-cash expense, net	70	225
Changes in operating assets and liabilities	12,332	8,425
Net cash provided by operating activities	58,815	56,195
Cash Flows from Investing Activities:
Capital expenditures	(44,764)	(37,957)
Capitalized interest	(1,379)	(2,001)
Change in unsettled capital expenditures	640	(227)
Proceeds on sale of assets	25	1
Net cash used by investing activities	(45,478)	(40,184)
Cash Flows from Financing Activities:
Repayments of long-term debt	(174,040)	(31,030)
Proceeds from the issuance of long-term debt	180,000	14,000
Debt issuance costs	(2,683)
Cash paid for debt extinguishment	(1,252)
Cash proceeds from noncontrolling interest		40
Payment of withholding taxes on stock-based compensation	(453)	(415)
Purchases of treasury stock	(1,812)
Proceeds from the issuance of common stock	211	211
Net cash used by financing activities	(29)	(17,194)
Change in cash and cash equivalents and restricted cash	13,308	(1,183)
Cash and cash equivalents and restricted cash, beginning of period	14,985	16,168
Cash and cash equivalents and restricted cash, end of period	28,293	14,985
Supplemental Cash Flow Data:
Interest paid	12,228	14,254
Income taxes (refunded) paid, net	$ (5,041)	$ 3