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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES      
Net income $ 67,262 $ 59,726 $ 18,652
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 104,114 98,530 98,814
Amortization of intangibles 4,521 4,538 4,239
Impairment of long-lived assets     6,244
Pension settlement expense 12,925 4,156 3,229
Share-based compensation expense 8,413 6,958 7,588
Provision for losses on accounts receivable 2,336 4,081 1,643
Deferred income tax provision (benefit) 1,872 (10,213) 9,522
Gain on sale of property and equipment (59) (75) (3,335)
Gain on sale of subsidiaries (1,945) (152)  
Changes in operating assets and liabilities:      
Receivables (23,554) (19,588) (23,809)
Prepaid expenses (2,988) (64) (1,393)
Other assets (4,341) (4,231) (4,355)
Income taxes 12,169 (2,144) 6,236
Multiemployer pension fund withdrawal liability 22,602    
Accounts payable, accrued expenses, and other liabilities 52,020 10,393 (11,335)
NET CASH PROVIDED BY OPERATING ACTIVITIES 255,347 151,915 111,940
INVESTING ACTIVITIES      
Purchases of property, plant and equipment, net of financings (43,992) (65,781) (68,271)
Proceeds from sale of property and equipment 4,256 4,279 8,804
Proceeds from sale of subsidiaries 4,680 2,490 2,780
Purchases of short-term investments (108,495) (73,459) (69,400)
Proceeds from sale of short-term investments 58,698 73,842 74,167
Business acquisitions, net of cash acquired     (24,780)
Capitalization of internally developed software (10,097) (9,840) (10,472)
NET CASH USED IN INVESTING ACTIVITIES (94,950) (68,469) (87,172)
FINANCING ACTIVITIES      
Borrowings under accounts receivable securitization program   10,000  
Payments on long-term debt (71,260) (68,924) (52,202)
Net change in book overdrafts 262 (502) (4,171)
Deferred financing costs (202) (937)  
Payment of common stock dividends (8,244) (8,264) (8,318)
Purchases of treasury stock (9,404) (6,019) (9,510)
Payments for tax withheld on share-based compensation (2,135) (3,270) (1,682)
NET CASH USED IN FINANCING ACTIVITIES (90,983) (77,916) (75,883)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 69,414 5,530 (51,115)
Cash and cash equivalents and restricted cash at beginning of period 120,772 115,242 166,357
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD 190,186 120,772 115,242
NONCASH INVESTING ACTIVITIES      
Equipment financed 94,016 84,170 83,366
Accruals for equipment received $ 2,807 $ 1,734 $ 397