Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net (loss) income	$ (3,254)	$ 656
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	27,124	25,908
Loss on disposal of assets, net	73	284
Amortization of debt issuance costs and debt discount	1,951	3,035
Loss on extinguishment of debt	7,527	336
Amortization of deferred capacity revenue	(2,601)	(2,564)
Stock-based compensation	842	2,147
Deferred income tax (benefit) expense	(1,840)	543
Tax deficiencies from share-based payments		(51)
Charge for uncollectible accounts	2,562	166
Other non-cash expense, net	430	466
Income taxes payable (receivable)	577	(852)
Changes in operating assets and liabilities	(7,703)	(1,710)
Net cash provided by operating activities	25,688	28,364
Cash Flows from Investing Activities:
Capital expenditures	(24,054)	(22,351)
Capitalized interest	(772)	(811)
Change in unsettled capital expenditures	2,007	(9,181)
Proceeds on sale of assets	6	2,664
Net cash used by investing activities	(22,813)	(29,679)
Cash Flows from Financing Activities:
Repayments of long-term debt	(174,378)	(12,355)
Proceeds from the issuance of long-term debt	183,000
Debt issuance costs and discounts	(5,559)	(44)
Cash paid for debt extinguishment	(5,522)	(150)
Cash proceeds from noncontrolling interest	75	75
Payment of withholding taxes on stock-based compensation	(601)	(472)
Proceeds from the issuance of common stock	116	130
Net cash used by financing activities	(2,869)	(12,816)
Change in cash, cash equivalents and restricted cash	6	(14,131)
Cash, cash equivalents and restricted cash, beginning of period	23,145	37,825
Cash, cash equivalents and restricted cash, end of period	23,151	23,694
Supplemental Cash Flow Data:
Interest paid	10,874	8,012
Income taxes (refunded) paid, net	$ (624)	$ 577