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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating Activities:    
Net income $ 23,850 $ 31,852
Noncash items included in net income:    
Depreciation and amortization 36,983 31,760
Other, net 6,351 (27)
Changes in operating assets and liabilities, net (1,370) 3,460
Net cash provided by operating activities 65,814 67,045
Investing Activities:    
Acquisition of business, net of cash received   (22,238)
Acquisition of property and equipment (102,140) (56,466)
Proceeds from disposal of property and equipment 595 517
Net cash used in investing activities (101,545) (78,187)
Financing Activities:    
Repayment of revolving credit agreement (73,372) (131,504)
Borrowing of revolving credit agreement 116,128 144,504
Proceeds from stock option exercises (including excess tax benefits) 248 2,629
Repayment of senior notes (3,572) (3,571)
Repayment of capital leases (3,465) (1,165)
Other financing activity   (455)
Net cash provided by financing activities 35,967 10,438
Net Increase (Decrease) in Cash and Cash Equivalents 236 (704)
Cash and cash equivalents, beginning of period 124 4,367
Cash and cash equivalents, end of period 360 3,663
Non Cash Investing Activities    
Equipment financed with capital leases $ 34,683 $ 17,336