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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
OPERATING ACTIVITIES    
Net income $ 84,342 $ 17,782
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 58,709 56,140
Amortization of intangibles 1,927 1,959
Pension settlement expense   89
Share-based compensation expense 5,678 5,071
Provision for losses on accounts receivable (334) 999
Change in deferred income taxes (7,612) (5,170)
Gain on sale of property and equipment and lease termination (8,408) (3,581)
Gain on sale of subsidiaries (6,923)  
Changes in operating assets and liabilities:    
Receivables (37,745) 9,626
Prepaid expenses 1,419 1,444
Other assets 25 4,358
Income taxes 12,275 8,413
Operating right-of-use assets and lease liabilities, net 761 (230)
Accounts payable, accrued expenses, and other liabilities 41,786 (14,833)
NET CASH PROVIDED BY OPERATING ACTIVITIES 145,900 82,067
INVESTING ACTIVITIES    
Purchases of property, plant and equipment, net of financings (25,395) (16,209)
Proceeds from sale of property and equipment 10,864 7,670
Proceeds from sale of subsidiaries 9,013  
Purchases of short-term investments (43,690) (97,493)
Proceeds from sale of short-term investments 49,165 46,725
Capitalization of internally developed software (9,477) (6,495)
NET CASH USED IN INVESTING ACTIVITIES (9,520) (65,802)
FINANCING ACTIVITIES    
Borrowings under credit facilities   180,000
Borrowings under accounts receivable securitization program   45,000
Payments on long-term debt (54,643) (29,185)
Net change in book overdrafts (922) 615
Deferred financing costs (189)  
Payment of common stock dividends (4,095) (4,082)
Purchases of treasury stock (8,100) (3,162)
Payments for tax withheld on share-based compensation (9,766) (1,070)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES (77,715) 188,116
NET INCREASE IN CASH AND CASH EQUIVALENTS 58,665 204,381
Cash and cash equivalents at beginning of period 303,954 201,909
CASH AND CASH EQUIVALENTS CASH AT END OF PERIOD 362,619 406,290
NONCASH INVESTING ACTIVITIES    
Equipment and other financings 8,138 13,566
Accruals for equipment received 5,984 857
Lease liabilities arising from obtaining right-of-use assets $ 6,051 $ 23,727