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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
OPERATING ACTIVITIES    
Net income $ 233,151 $ 262,053
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 45,377 35,059
Provision for doubtful accounts 7,669 2,144
Stock-based compensation 16,842 25,785
Deferred income taxes (4,988) 17,004
Excess tax benefit on stock-based compensation (10,583) (15,104)
Loss on sale/disposal of assets 536 366
Changes in operating elements (net of acquisitions):    
Receivables (244,682) (94,030)
Prepaid expenses and other (9,646) (19,066)
Other non-current assets (1,016) (1,615)
Accounts payable and outstanding checks 135,130 52,843
Accrued compensation (23,353) (61,029)
Accrued income taxes 10,185 43,606
Other accrued liabilities (4,611) (755)
Net cash provided by operating activities 150,011 247,261
INVESTING ACTIVITIES    
Purchases of property and equipment (24,105) (33,483)
Purchases and development of software (8,865) (10,493)
Acquisitions, net of cash acquired (1,780) 0
Other (1,095) (405)
Net cash used for investing activities (35,845) (44,381)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 19,814 12,132
Stock tendered for payment of withholding taxes (19,626) (33,133)
Repurchase of common stock (70,494) (45,248)
Cash dividends (128,806) (127,520)
Excess tax benefit on stock-based compensation 0 15,104
Proceeds from long-term borrowings 250,000 0
Proceeds from short-term borrowings 4,282,000 2,840,000
Payments on short-term borrowings (4,430,000) (2,825,000)
Net cash used for financing activities (97,112) (163,665)
Effect of exchange rates on cash 8,462 (361)
Net increase in cash and cash equivalents 25,516 38,854
Cash and cash equivalents, beginning of period 247,666 168,229
Cash and cash equivalents, end of period 273,182 207,083
Noncash transactions from investing and financing activities:    
Accrued share repurchases held in other accrued liabilities 1,500 3,000
Accrued purchases of property and equipment $ 0 $ 5,359