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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Service revenues $ 302,131 $ 283,700 $ 593,544 $ 550,162
Product sales 184,073 151,788 368,541 372,756
Total revenues 486,204 435,488 962,085 922,918
Costs and expenses:        
Operating expenses (excluding depreciation and amortization expense) 131,672 116,400 240,556 217,426
Depreciation and amortization expense 73,613 65,402 143,510 120,073
Total costs associated with service revenues 205,285 181,802 384,066 337,499
Cost of product sales 170,849 144,479 347,577 352,285
General and administrative expenses (excluding depreciation and amortization expense) 27,981 33,604 47,755 58,199
Other depreciation and amortization expense 2,251 2,199 4,369 4,392
Total costs and expenses 406,366 362,084 783,767 752,375
Operating income 79,838 73,404 178,318 170,543
Interest expense, net (48,936) (45,612) (96,708) (82,026)
Other income, net 1,412 88 81,164 228
Income before income tax expense 32,314 27,880 162,774 88,745
Income tax expense 2,915 1,630 7,242 4,555
Net income $ 29,399 $ 26,250 $ 155,532 $ 84,190
Basic net income per common unit $ 0.15 $ 0.05 $ 1.30 $ 0.51
Basic weighted-average common units outstanding 93,192,238 90,345,469 93,187,038 84,526,506
Comprehensive income $ 26,778 $ 27,381 $ 173,835 $ 89,084