UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Total revenue	$ 153,188	$ 158,843
Operating expenses
Selling, general and administrative	30,991	28,722
Depreciation and amortization	36,911	41,179
Total operating expenses	130,138	134,056
Operating income	23,050	24,787
Other income (expense):
Interest expense	(6,211)	(7,954)
Other	733	1,287
Income before income taxes	17,572	18,120
Income tax expense	4,292	4,210
Net income	13,280	13,910
Other comprehensive income:
Unrealized loss on interest rate hedge, net of tax	(6,106)	(2,728)
Comprehensive income	$ 7,174	$ 11,182
Net income per share, basic and diluted:
Basic net income per share (in dollars per share)	$ 0.27	$ 0.28
Diluted net income per share (in dollars per share)	$ 0.27	$ 0.28
Weighted average shares outstanding, basic (in shares)	49,888	49,775
Weighted average shares outstanding, diluted (in shares)	50,036	50,115
Service revenue and other
Revenue:
Total revenue	$ 140,188	$ 143,231
Equipment revenue
Revenue:
Total revenue	13,000	15,612
Services
Operating expenses
Cost of services and cost of goods sold	49,565	49,518
Products
Operating expenses
Cost of services and cost of goods sold	$ 12,671	$ 14,637