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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income $ 171,474,000 $ 73,559,000 $ 107,171,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 130,629,000 123,679,000 116,887,000
Deferred taxes (3,992,000) 7,463,000 1,821,000
Compensation expense related to share-based compensation plans 20,056,000 17,053,000 16,286,000
(Gain) loss on sale of assets (19,173,000) 907,000 (745,000)
Other operating activities   6,385,000 0
Changes in operating assets and liabilities, net of acquisitions:      
Restricted investments (903,000) (752,000) (3,365,000)
Accounts receivable, net (115,568,000) (47,219,000) 32,732,000
Prepaid taxes (856,000) (707,000) (14,000)
Prepaid expenses and other current assets (647,000) (2,508,000) 3,447,000
Other assets (2,883,000) (2,177,000) (3,786,000)
Accounts payable 78,448,000 5,594,000 (14,933,000)
Accrued expenses 9,686,000 (4,408,000) (122,000)
Non-current liabilities (13,436,000) (1,915,000) (870,000)
Net cash provided by operating activities 252,835,000 174,954,000 254,509,000
Cash flows from investing activities:      
Proceeds from sale of equipment 45,177,000 3,289,000 10,025,000
Purchases of property and equipment (132,952,000) (115,306,000) (94,847,000)
Acquisitions, net of cash acquired (122,360,000) (84,845,000) (734,000)
Proceeds from the disposition of discontinued operations 0 0 19,439,000
Net cash used in investing activities (210,135,000) (196,862,000) (66,117,000)
Cash flows from financing activities:      
Proceeds from issuance of debt 112,001,000 187,475,000 56,494,000
Repayments of long-term debt (107,608,000) (198,741,000) (105,653,000)
Stock tendered for payments of withholding taxes (9,123,000) (7,963,000) (3,984,000)
Purchase of treasury stock 0 0 (24,998,000)
Finance lease payments (2,682,000) (3,066,000) (2,954,000)
Net cash used in financing activities (7,412,000) (22,295,000) (81,095,000)
Effect of exchange rate changes on cash and cash equivalents (10,000) (20,000) (3,000)
Net increase (decrease) in cash and cash equivalents 35,278,000 (44,223,000) 107,294,000
Cash and cash equivalents beginning of the year 124,506,000 168,729,000 61,435,000
Cash and cash equivalents end of the year 159,784,000 124,506,000 168,729,000
Supplemental disclosures of cash paid for:      
Interest 7,602,000 9,458,000 11,262,000
Income taxes $ 58,593,000 $ 18,388,000 $ 40,289,000