Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income	$ 193	$ 2,069
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,679	8,787
Gain on disposal of assets, net	(2)	(3)
Amortization of debt issuance costs and debt discount	303	356
Loss on extinguishment of debt	2,799
Amortization of deferred capacity revenue	(1,126)	(947)
Stock-based compensation	498	242
Income tax expense (benefit)	98	(112)
Charge for uncollectible accounts	(697)	537
Amortization of right-of-use assets	565
Other non-cash expense, net	121	90
Changes in operating assets and liabilities	4,044	2,402
Net cash provided by operating activities	15,475	13,421
Cash Flows from Investing Activities:
Capital expenditures	(8,563)	(8,680)
Capitalized interest	(355)	(420)
Change in unsettled capital expenditures	(1,121)	(1,272)
Net cash used by investing activities	(10,039)	(10,372)
Cash Flows from Financing Activities:
Repayments of long-term debt	(171,758)	(8,807)
Proceeds from the issuance of long-term debt	180,000	7,000
Debt issuance costs and discounts	(2,659)
Cash paid for debt extinguishment	(1,222)
Cash proceeds from noncontrolling interest		40
Payment of withholding taxes on stock-based compensation	(305)	(410)
Net cash provided (used) by financing activities	4,056	(2,177)
Change in cash, cash equivalents and restricted cash	9,492	872
Cash, cash equivalents and restricted cash, beginning of period	14,985	16,168
Cash, cash equivalents and restricted cash, end of period	24,477	17,040
Supplemental Cash Flow Data:
Interest paid	3,075	3,441
Income taxes paid, net	$ 10