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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities    
Net income $ 3,930 $ 5,342
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 25,237 6,552
Amortization of debt issuance costs and discounts on debt 1,267 191
Share-based compensation 1,844 1,427
Loss on disposal of property and equipment 77  
Change in fair value of derivative (3,211)  
Deferred income taxes 373 (1,716)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable 646 758
Income taxes 846 2,146
Prepaid expenses 2,542 181
Inventories and other current assets 797 (720)
Other assets 326 (1,003)
Accounts payable and other accrued expenses (5,359) (2,410)
Accrued taxes, other than income taxes 807 (280)
Other liabilities (63) 233
Net cash provided by operating activities 30,059 10,701
Cash flows from investing activities    
Purchase of property and equipment (10,242) (5,680)
Other investing activities 28 (75)
Net cash used in investing activities (10,214) (5,755)
Cash flows from financing activities    
Repayments of term loans (2,000) (3,000)
Repayments of revolving credit facility   (3,000)
Repayments of notes payable (108) (696)
Principal payments under capital leases (229) (136)
Proceeds from issuance of common stock 25,969 158
Stock issuance costs (362)  
Net cash provided by (used in) financing activities 23,270 (6,674)
Cash and cash equivalents    
Net increase (decrease) for the period 43,115 (6,674)
Balance, beginning of period 90,579 46,898
Balance, end of period 133,694 40,224
Supplemental cash flow disclosures    
Cash paid for interest 14,615 1,483
Non-cash investing and financing activities    
Payables incurred for capital expenditures 1,652  
Assets acquired under capital lease obligations $ 62 $ 1,978