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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 |

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