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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating revenue:        
Operating revenues $ 155,152 $ 158,731 $ 472,909 $ 469,370
Operating expenses:        
Selling, general and administrative 27,178 27,452 83,070 86,117
Depreciation and amortization 36,626 40,028 120,158 124,632
Total operating expenses 129,793 130,402 398,743 403,118
Operating income 25,359 28,329 74,166 66,252
Other income (expense):        
Interest expense (7,505) (9,001) (22,981) (27,184)
Other 1,099 1,054 3,562 2,882
Income before income taxes 18,953 20,382 54,747 41,950
Income tax expense 4,599 4,848 13,333 10,207
Net income 14,354 15,534 41,414 31,743
Other comprehensive income (loss):        
Unrealized gain (loss) on interest rate hedge, net of tax (1,494)   (8,434)  
Unrealized gain (loss) on interest rate hedge, net of tax   465   4,360
Comprehensive income $ 12,860 $ 15,999 $ 32,980 $ 36,103
Net income per share, basic and diluted:        
Basic net income per share (in dollars per share) $ 0.29 $ 0.31 $ 0.83 $ 0.64
Diluted net income per share (in dollars per share) $ 0.29 $ 0.31 $ 0.83 $ 0.63
Weighted average shares outstanding, basic (in shares) 49,857 49,559 49,827 49,527
Weighted average shares outstanding, diluted (in shares) 50,129 50,117 50,110 50,044
Service revenue and other        
Operating revenue:        
Operating revenues $ 138,832 $ 142,768 $ 424,122 $ 419,819
Equipment revenue        
Operating revenue:        
Operating revenues 16,320 15,963 48,787 49,551
Cost of services        
Operating expenses:        
Cost of services 50,164 47,886 149,179 146,362
Cost of goods sold        
Operating expenses:        
Cost of services $ 15,825 $ 15,036 $ 46,336 $ 46,007