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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities      
Net income (loss) $ (20,914) $ 2,084 $ 16,300
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 94,456 40,786 27,506
Amortization of debt issuance costs and discounts on debt 5,062 1,593 732
Share-based compensation 9,641 8,754 3,878
Loss on disposal of property and equipment 3,336 441 54
Gain on contingent consideration   (1,719)  
Loss (gain) on extinguishment of debt   1,708 (18)
Gain on change in fair value of derivative (1,786) (178)  
Gain on sale of land held for sale     (4,525)
Deferred income taxes 10,380 (7,825) (4,325)
Other operating activities     (49)
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable 1,913 (1,593) (3,151)
Income taxes receivable (741) 2,121 (262)
Prepaid expenses 1,469 74 (3,810)
Inventories and other current assets (1,034) (568) 102
Other assets (368) (2,056)  
Accounts payable and other accrued expenses (4,915) (22,519) 1,580
Accrued taxes, other than income taxes (124) 511 2,193
Other liabilities 1,575 488 1,190
Net cash provided by operating activities 97,950 22,102 37,395
Cash flows from investing activities      
Purchase of property and equipment, net of change in construction payables (68,175) (29,463) (30,634)
Acquisition of businesses, net of cash acquired   (724,473) (41,273)
Purchase of intangibles and other assets (1,134) (2,220)  
Proceeds from disposal of property and equipment 103   2,985
Other investing activities   (31) (2,198)
Net cash used in investing activities (69,206) (756,187) (71,120)
Cash flows from financing activities      
Proceeds from term loans   969,000 40,000
Repayments of term loans (8,000) (150,000) (8,500)
Borrowings on revolving credit facility   6,000 5,000
Repayments of revolving credit facility   (36,000)  
Repayments of notes payable (506) (3,334) (2,061)
Purchase of derivative   (3,152)  
Proceeds from leased equipment obligation   743  
Principal payments under capital leases (1,039) (610) (756)
Payments for debt issuance costs (219) (4,035) (500)
Repurchases of common stock (19,598)    
Proceeds from the exercise of stock options 1,322 169 1,792
Proceeds from issuance of common stock, net of issuance costs 25,608    
Tax withholding on share-based payments (820) (1,015)  
Dividends paid     (23,529)
Net cash provided by (used in) financing activities (3,252) 777,766 11,446
Cash and cash equivalents      
Change in cash and cash equivalents 25,492 43,681 (22,279)
Balance, beginning of period 90,579 46,898 69,177
Balance, end of period 116,071 90,579 46,898
Supplemental cash flow disclosures      
Cash paid for interest 60,542 14,143 5,721
Cash paid (received) for income taxes, net   (84) 260
Non-cash investing and financing activities      
Payables incurred for capital expenditures 10,797 1,849  
Notes payable issued for property and equipment 800 717 721
Assets acquired under capital lease obligations $ 2,398 2,758 2,726
Common stock issued in connection with acquisitions   $ 101,486 $ 500