UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating revenue:
Operating revenues	$ 158,731	$ 151,782	$ 469,370	$ 458,920
Operating expenses:
Selling, general and administrative	27,452	42,199	86,117	125,374
Acquisition, integration and migration expenses	0	1,706	0	9,873
Depreciation and amortization	40,028	42,568	124,632	132,297
Total operating expenses	130,402	142,307	403,118	430,520
Operating income (loss)	28,329	9,475	66,252	28,400
Other income (expense):
Interest expense	(9,001)	(9,823)	(27,184)	(28,312)
Gain (loss) on investments, net	88	202	112	395
Non-operating income (loss), net	966	1,003	2,770	3,482
Income (loss) before income taxes	20,382	857	41,950	3,965
Income tax expense (benefit)	4,848	(2,677)	10,207	(1,830)
Net income (loss)	15,534	3,534	31,743	5,795
Other comprehensive income (loss):
Unrealized gain (loss) on interest rate hedge, net of tax	465	6	4,360	(770)
Comprehensive income (loss)	$ 15,999	$ 3,540	$ 36,103	$ 5,025
Net income (loss) per share, basic and diluted:
Basic net income (loss) per share (in dollars per share)	$ 0.31	$ 0.07	$ 0.64	$ 0.12
Diluted net income (loss) per share (in dollars per share)	$ 0.31	$ 0.07	$ 0.63	$ 0.12
Weighted average shares outstanding, basic (in shares)	49,559	49,133	49,527	49,100
Weighted average shares outstanding, diluted (in shares)	50,117	49,959	50,044	49,869
Service revenue and other
Operating revenue:
Operating revenues	$ 142,768	$ 149,788	$ 419,819	$ 450,617
Equipment revenue
Operating revenue:
Operating revenues	15,963	1,994	49,551	8,303
Cost of services
Operating expenses:
Cost of services	47,886	48,552	146,362	145,744
Cost of goods sold
Operating expenses:
Cost of services	$ 15,036	$ 7,282	$ 46,007	$ 17,232