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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES      
Net income $ 39,985 $ 67,262 $ 59,726
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 108,099 104,114 98,530
Amortization of intangibles 4,367 4,521 4,538
Pension settlement expense, including termination expense 8,505 12,925 4,156
Share-based compensation expense 9,523 8,413 6,958
Provision for losses on accounts receivable 1,223 2,336 4,081
Change in deferred income taxes 5,411 1,872 (10,213)
Asset impairment 26,514    
Gain on sale of property and equipment (5,247) (59) (75)
Gain on sale of subsidiaries   (1,945) (152)
Changes in operating assets and liabilities:      
Receivables 13,720 (23,554) (19,588)
Prepaid expenses (4,756) (2,988) (64)
Other assets (1,365) (4,341) (4,231)
Income taxes (8,720) 12,169 (2,144)
Operating right-of-use assets and lease liabilities, net 728    
Multiemployer pension fund withdrawal liability (584) 22,602  
Accounts payable, accrued expenses, and other liabilities (27,039) 52,020 10,393
NET CASH PROVIDED BY OPERATING ACTIVITIES 170,364 255,347 151,915
INVESTING ACTIVITIES      
Purchases of property, plant and equipment, net of financings (90,955) (43,992) (65,781)
Proceeds from sale of property and equipment 13,490 4,256 4,279
Proceeds from sale of subsidiaries   4,680 2,490
Purchases of short-term investments (129,709) (108,495) (73,459)
Proceeds from sale of short-term investments 120,409 58,698 73,842
Capitalization of internally developed software (11,476) (10,097) (9,840)
NET CASH USED IN INVESTING ACTIVITIES (98,241) (94,950) (68,469)
FINANCING ACTIVITIES      
Payments on long-term debt (58,938) (71,260) (68,924)
Borrowings under accounts receivable securitization program     10,000
Proceeds from notes payable 20,410    
Net change in book overdrafts (2,722) 262 (502)
Deferred financing costs (562) (202) (937)
Payment of common stock dividends (8,187) (8,244) (8,264)
Purchases of treasury stock (9,110) (9,404) (6,019)
Payments for tax withheld on share-based compensation (1,291) (2,135) (3,270)
NET CASH USED IN FINANCING ACTIVITIES (60,400) (90,983) (77,916)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 11,723 69,414 5,530
Cash and cash equivalents and restricted cash at beginning of period 190,186 120,772 115,242
CASH AND CASH EQUIVALENTS CASH AT END OF PERIOD 201,909 190,186 120,772
NONCASH INVESTING ACTIVITIES      
Equipment and other financings 70,372 94,016 84,170
Accruals for equipment received 234 $ 2,807 $ 1,734
Lease liabilities arising from obtaining right-of-use assets $ 32,761