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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating Activities:    
Net income $ 56,565 $ 59,332
Noncash items included in net income:    
Depreciation and amortization 66,254 55,925
Deferred income taxes 7,570  
Other, net 7,239 17,403
Changes in operating assets and liabilities, net 10,605 (19,086)
Net cash provided by operating activities 148,233 113,574
Investing Activities:    
Acquisition of property and equipment (148,865) (166,434)
Proceeds from disposal of property and equipment 6,143 380
Net cash used in investing activities (142,722) (166,054)
Financing Activities:    
Repayment of revolving credit agreement (221,026) (100,517)
Borrowing of revolving credit agreement 255,097 161,515
Proceeds from stock option exercises 2,591 2,154
Shares withheld for taxes (3,479) (3,304)
Debt issuance costs   (23)
Repayment of finance leases (9,662) (9,036)
Net cash provided by financing activities 23,521 50,789
Net Increase (Decrease) in Cash and Cash Equivalents 29,032 (1,691)
Cash and cash equivalents, beginning of period 248 2,194
Cash and cash equivalents, end of period $ 29,280 503
Non Cash Investing Activities    
Equipment financed with finance leases   $ 5,058