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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
OPERATING ACTIVITIES    
Net income $ 477,862 $ 477,355
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 75,122 72,402
Provision for doubtful accounts 642 12,333
Stock-based compensation 40,657 68,475
Deferred income taxes (3,360) (5,794)
Excess tax benefit on stock-based compensation (6,908) (9,345)
Other operating activities (4,471) 1,350
Changes in operating elements (net of acquisitions):    
Receivables 104,108 (268,252)
Contract assets 9,067 (53,647)
Prepaid expenses and other (18,940) 14,740
Accounts payable and outstanding checks 3,871 120,652
Accrued compensation (45,319) 15,153
Accrued transportation expense (5,323) 62,165
Accrued income taxes (7,042) 9,247
Other accrued liabilities 5,210 9,944
Other assets and liabilities (1,318) 2,105
Net cash provided by operating activities 623,858 528,883
INVESTING ACTIVITIES    
Purchases of property and equipment (26,661) (35,794)
Purchases and development of software (24,282) (13,793)
Acquisitions, net of cash acquired (59,188) (1,315)
Other investing activities 16,625 (1,605)
Net cash used for investing activities (93,506) (52,507)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 40,442 46,424
Stock tendered for payment of withholding taxes (14,352) (20,603)
Repurchase of common stock (241,303) (202,094)
Cash dividends (207,865) (195,158)
Proceeds from long-term borrowings 929,000 591,012
Payments on long-term borrowings (1,018,000) 0
Proceeds from short-term borrowings 14,000 2,588,000
Payments on short-term borrowings (19,000) (3,303,000)
Net cash used for financing activities (517,078) (495,419)
Effect of exchange rates on cash (7,465) (17,046)
Net change in cash and cash equivalents 5,809 (36,089)
Cash and cash equivalents, beginning of period 378,615 333,890
Cash and cash equivalents, end of period 384,424 297,801
Noncash transactions from financing activities:    
Accrued share repurchases held in other accrued liabilities $ 1,522 $ 4,300