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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net Income $ 59,726 $ 18,652 $ 44,854
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 98,530 98,814 89,040
Amortization of intangibles 4,538 4,239 4,002
Impairment of long-lived assets   6,244  
Pension settlement expense 4,156 3,229 3,202
Share-based compensation expense 6,958 7,588 8,029
Provision for losses on accounts receivable 4,081 1,643 998
Deferred income tax provision (benefit) (10,213) 9,522 16,435
Gain on sale of property and equipment (227) (3,335) (2,225)
Changes in operating assets and liabilities:      
Receivables (19,588) (23,809) 2,310
Prepaid expenses (64) (1,393) 362
Other assets (4,231) (4,355) 1,090
Income taxes (2,144) 6,236 (8,918)
Accounts payable, accrued expenses, and other liabilities 10,393 (11,335) (10,048)
NET CASH PROVIDED BY OPERATING ACTIVITIES 151,915 111,940 149,131
INVESTING ACTIVITIES      
Purchases of property, plant and equipment, net of financings (65,781) (68,271) (78,425)
Proceeds from sale of property and equipment 4,279 8,804 6,639
Purchases of short-term investments (73,459) (69,400) (61,363)
Proceeds from sale of short-term investments 73,842 74,167 45,831
Business acquisitions, net of cash acquired   (24,780) (29,813)
Proceeds from sale of subsidiaries 2,490 2,780  
Capitalization of internally developed software (9,840) (10,472) (8,512)
NET CASH USED IN INVESTING ACTIVITIES (68,469) (87,172) (125,643)
FINANCING ACTIVITIES      
Borrowings under credit facilities     70,000
Borrowings under accounts receivable securitization program 10,000   35,000
Payments on long-term debt (68,924) (52,202) (100,813)
Net change in book overdrafts (502) (4,171) 3,843
Deferred financing costs (937)   (875)
Payment of common stock dividends (8,264) (8,318) (6,837)
Purchases of treasury stock (6,019) (9,510) (12,765)
Payments for tax withheld on share-based compensation (3,270) (1,682) (3,112)
NET CASH USED IN FINANCING ACTIVITIES (77,916) (75,883) (15,559)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 5,530 (51,115) 7,929
Cash and cash equivalents and restricted cash at beginning of period 115,242 166,357 158,428
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD 120,772 115,242 166,357
NONCASH INVESTING ACTIVITIES      
Equipment financed 84,170 83,366 80,592
Accruals for equipment received $ 1,734 $ 397 $ 748