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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 2,171 $ 16,300 $ 24,520
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 40,786 27,506 10,798
Amortization of debt issuance costs and discounts on debt 1,593 732 525
Accretion and amortization of discounts and premiums on short-term investments     240
Share-based compensation 8,754 3,878 809
Loss on disposal of property and equipment 441 54 303
Gain on revaluation of contingent consideration (1,719)    
Loss (gain) on extinguishment of debt 1,708 (18) 1,174
Gain on change in fair value of derivative (178)    
Gain on sale of land held for sale   (4,525)  
Gain on sale of notes receivable     (23,590)
Impairments and other losses     357
Deferred income taxes (7,825) (4,325) (10,216)
Other operating activities   (49)  
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable (1,593) (3,151) 1,033
Income taxes receivable 2,121 (262) 77
Prepaid expenses 74 (3,810) 2,035
Inventories and other current assets (568) 102 371
Other assets (2,056)    
Accounts payable and other accrued expenses (22,606) 1,580 900
Accrued taxes, other than income taxes 511 2,193 6
Other liabilities 488 1,190  
Net cash provided by operating activities 22,102 37,395 9,342
Cash flows from investing activities      
Purchase of property and equipment (29,463) (30,634) (7,946)
Acquisition of businesses, net of cash acquired (724,473) (41,273) 25,539
Asset purchase (2,220)    
Proceeds from disposal of property and equipment   2,985 4,413
Purchase of short-term investments     (25,137)
Proceeds from maturities of short-term investments     35,175
Proceeds from sale of short-term investments     36,182
Collection on notes receivable     23,590
Other investing activities (31) (2,198) (1,767)
Net cash provided by (used in) investing activities (756,187) (71,120) 90,049
Cash flows from financing activities      
Proceeds from term loans 969,000 40,000 145,000
Repayments of term loans (150,000) (8,500) (204,560)
Borrowings on revolving credit facility 6,000 5,000  
Repayments of revolving credit facility (36,000)    
Repayments of notes payable (3,334) (2,061)  
Payments for debt issuance costs (4,035) (500) (2,803)
Purchase of derivative instrument (3,152)    
Proceeds from leased equipment obligation 743    
Principal payments under capital leases (610) (756)  
Proceeds from issuance of common stock 169 1,792 168
Tax withholding on share-based payments (1,015)    
Dividends paid   (23,529)  
Warrant repurchase     (3,435)
Net cash provided by (used in) financing activities 777,766 11,446 (65,630)
Cash and cash equivalents      
Net increase (decrease) for the period 43,681 (22,279) 33,761
Balance, beginning of period 46,898 69,177 35,416
Balance, end of period 90,579 46,898 69,177
Supplemental cash flow disclosures      
Cash paid for interest 14,143 5,721 2,321
Cash paid (received) for income taxes, net (84) 260 170
Non-cash investing and financing activities      
Payables incurred for capital expenditures 1,849    
Notes payable issued for property and equipment 717 721 2,838
Assets acquired under capital lease obligations 2,758 2,726  
Common stock issued in connection with acquisition $ 101,486 $ 500 $ 77,350