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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
OPERATING ACTIVITIES    
Net income $ 477,355 $ 352,337
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 68,475 24,509
Depreciation and amortization 72,402 69,340
Provision for doubtful accounts 12,333 11,176
Deferred income taxes (5,794) (6,779)
Excess tax benefit on stock-based compensation (9,345) (11,908)
Other 1,350 1,352
Changes in operating elements (net of acquisitions):    
Receivables (268,252) (377,280)
Contract assets (53,647) 0
Prepaid expenses and other 14,740 677
Other non-current assets 2,105 (2,220)
Accounts payable and outstanding checks 120,652 166,152
Accrued transportation expense 62,165 0
Accrued compensation 15,153 (6,102)
Accrued income taxes 9,247 7,873
Other accrued liabilities 9,944 (10,778)
Net cash provided by operating activities 528,883 218,349
INVESTING ACTIVITIES    
Purchases of property and equipment (35,794) (32,132)
Purchases and development of software (13,793) (14,286)
Acquisitions, net of cash acquired (1,315) (48,446)
Other (1,605) 204
Net cash used for investing activities (52,507) (94,660)
FINANCING ACTIVITIES    
Proceeds from long-term borrowings 591,012 250,000
Proceeds from short-term borrowings 2,588,000 6,448,000
Payments on short-term borrowings (3,303,000) (6,469,000)
Repurchase of common stock (202,094) (129,991)
Proceeds from stock issued for employee benefit plans 46,424 23,270
Stock tendered for payment of withholding taxes (20,603) (20,746)
Cash dividends (195,158) (192,765)
Net cash used for financing activities (495,419) (91,232)
Effect of exchange rates on cash (17,046) 17,184
Net change in cash and cash equivalents (36,089) 49,641
Cash and cash equivalents, beginning of period 333,890 247,666
Cash and cash equivalents, end of period 297,801 297,307
Noncash transactions from investing and financing activities:    
Accrued share repurchases held in other accrued liabilities 4,300 4,000
Accrued purchases of property and equipment $ 1,104 $ 800