UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues:
Operating revenues	$ 154,030	$ 153,258	$ 305,762	$ 307,138
Total operating revenues	154,030	153,258	305,762	307,138
Operating expenses:
Operating expenses:	49,134	48,416	98,476	97,193
Cost of goods sold	15,166	4,965	30,971	9,949
Selling, general and administrative	29,915	43,022	58,665	83,175
Acquisition, integration and migration expenses	0	3,678	0	8,167
Depreciation and amortization	41,117	44,925	84,604	89,729
Total operating expenses	135,332	145,006	272,716	288,213
Operating income (loss)	18,698	8,252	33,046	18,925
Other income (expense):
Interest expense	(8,851)	(9,389)	(18,183)	(18,489)
Gain (loss) on investments, net	56	73	24	193
Non-operating income (loss), net	783	1,224	1,804	2,479
Income (loss) before income taxes	10,686	160	16,691	3,108
Income tax expense (benefit)	2,862	240	4,038	847
Net income (loss)	7,824	(80)	12,653	2,261
Other comprehensive income (loss):
Unrealized gain (loss) on interest rate hedge, net of tax	833	(1,375)	3,895	(776)
Comprehensive income (loss)	$ 8,657	$ (1,455)	$ 16,548	$ 1,485
Net income (loss) per share:
Basic (in dollars per share)	$ 0.16	$ 0.00	$ 0.26	$ 0.05
Diluted (in dollars per share)	$ 0.16	$ 0.00	$ 0.25	$ 0.05
Weighted average shares outstanding, basic (in shares)	49,547	49,115	49,511	49,083
Weighted average shares outstanding, diluted (in shares)	50,070	49,115	50,029	49,850
Service revenues and other
Operating revenues:
Operating revenues	$ 138,021	$ 150,308	$ 272,174	$ 300,829
Equipment revenues
Operating revenues:
Operating revenues	$ 16,009	$ 2,950	$ 33,588	$ 6,309