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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues [Abstract]      
Service revenue and other $ 220,775 $ 206,862 $ 192,683
Operating expenses      
Cost of services 88,203 82,949 80,418
Selling, general and administrative 85,016 77,846 70,844
Depreciation and amortization 48,703 46,786 44,390
Total operating expenses 221,922 207,581 195,652
Operating loss (1,147) (719) (2,969)
Other income:      
Other income, net 3,187 3,280 3,703
Income before income taxes 2,040 2,561 734
Income tax (benefit) expense (586) 173 (1,343)
Income from continuing operations 2,626 2,388 2,077
Income from discontinued operations, net of tax 124,097 53,568 44,518
Net income 126,723 55,956 46,595
Other comprehensive income:      
Unrealized (loss) income on interest rate hedge, net of tax (5,014) (7,972) 50
Comprehensive income $ 121,709 $ 47,984 $ 46,645
Net income per share, basic and diluted:      
Basic - Income from continuing operations (in dollars per share) $ 0.05 $ 0.05 $ 0.04
Basic - Income from discontinued operations, net of tax (in dollars per share) 2.49 1.07 0.90
Basic net income per share (in dollars per share) 2.54 1.12 0.94
Diluted - Income from continuing operations (in dollars per share) 0.05 0.05 0.04
Diluted - Income from discontinued operations, net of tax (in dollars per share) 2.48 1.07 0.89
Diluted net income per share (in dollars per share) $ 2.53 $ 1.12 $ 0.93
Weighted average shares outstanding, basic (in shares) 49,901 49,811 49,542
Weighted average shares outstanding, diluted (in shares) 50,024 50,101 50,063
Cash dividend declared per share (in dollars per share) $ 0.34 $ 0.29 $ 0.27