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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
OPERATING ACTIVITIES    
Net income $ 29,264 $ 11,187
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 51,722 51,409
Amortization of intangibles 2,249 2,264
Pension settlement expense 1,634 1,085
Share-based compensation expense 4,859 3,544
Provision for losses on accounts receivable 621 1,069
Change in deferred income taxes 5,124 (10,818)
Gain on sale of property and equipment (1,469) (166)
Changes in operating assets and liabilities:    
Receivables 1,781 (31,281)
Prepaid expenses (3,323) 2,393
Other assets (2,798) 2,018
Income taxes (3,042) 8,024
Operating right-of-use assets and lease liabilities, net 159  
Multiemployer pension fund withdrawal liability (289) 37,922
Accounts payable, accrued expenses, and other liabilities (6,021) 40,914
NET CASH PROVIDED BY OPERATING ACTIVITIES 80,471 119,564
INVESTING ACTIVITIES    
Purchases of property, plant and equipment, net of financings (41,909) (24,763)
Proceeds from sale of property and equipment 3,798 2,074
Purchases of short-term investments (43,327) (26,006)
Proceeds from sale of short-term investments 33,332 14,647
Capitalization of internally developed software (5,535) (5,997)
NET CASH USED IN INVESTING ACTIVITIES (53,641) (40,045)
FINANCING ACTIVITIES    
Payments on long-term debt (29,984) (33,694)
Proceeds from notes payable 9,552  
Net change in book overdrafts (4,398) (2,888)
Payment of common stock dividends (4,102) (4,116)
Purchases of treasury stock (5,171) (201)
Payments for tax withheld on share-based compensation (1,182) (85)
NET CASH USED IN FINANCING ACTIVITIES (35,285) (40,984)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (8,455) 38,535
Cash and cash equivalents at beginning of period 190,186 120,772
CASH AND CASH EQUIVALENTS CASH AT END OF PERIOD 181,731 159,307
NONCASH INVESTING ACTIVITIES    
Equipment financed 10,964 14,407
Accruals for equipment received 19,402 $ 8,649
Lease liabilities arising from obtaining right-of-use assets $ 23,049