Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 7,276	$ (3,254)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	25,336	27,124
Loss on disposal of assets, net	56	73
Amortization of debt issuance costs and debt discount	1,022	1,951
Loss on extinguishment of debt		7,527
Amortization of deferred capacity revenue	(2,997)	(2,601)
Stock-based compensation	1,209	842
Income tax expense (benefit)	2,080	(1,886)
Charge for uncollectible accounts	2,371	2,562
Other non-cash expense, net	168	430
Income taxes (receivable) payable	(37)	577
Changes in operating assets and liabilities	10,395	(7,657)
Net cash provided by operating activities	46,879	25,688
Cash Flows from Investing Activities:
Capital expenditures	(25,432)	(24,054)
Capitalized interest	(1,456)	(772)
Change in unsettled capital expenditures	(1,811)	2,007
Proceeds on sale of assets	1	6
Net cash used by investing activities	(28,698)	(22,813)
Cash Flows from Financing Activities:
Repayments of long-term debt	(29,164)	(174,378)
Proceeds from the issuance of long-term debt	14,000	183,000
Debt issuance costs and discounts		(5,559)
Cash paid for debt extinguishment		(5,522)
Cash proceeds from noncontrolling interest	40	75
Payment of withholding taxes on stock-based compensation	(410)	(601)
Proceeds from the issuance of common stock	111	116
Net cash used by financing activities	(15,423)	(2,869)
Change in cash, cash equivalents and restricted cash	2,758	6
Cash, cash equivalents and restricted cash, beginning of period	16,168	23,145
Cash, cash equivalents and restricted cash, end of period	18,926	23,151
Supplemental Cash Flow Data:
Interest paid	10,723	10,874
Income taxes paid (refunded), net	$ 4	$ (624)