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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
OPERATING ACTIVITIES    
Net income $ 262,053 $ 243,684
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 35,059 32,682
Provision for doubtful accounts 2,144 9,053
Stock-based compensation 25,785 31,019
Deferred income taxes 17,004 (1,780)
Loss on sale/disposal of assets 366 438
Changes in operating elements (net of acquisitions):    
Receivables (94,030) (87,663)
Prepaid expenses and other (19,066) (19,802)
Other non-current assets (1,615) 736
Accounts payable and outstanding checks 52,843 56,891
Accrued compensation and profit-sharing contribution (61,029) (32,027)
Accrued income taxes 28,502 21,230
Other accrued liabilities (755) (3,265)
Net cash provided by operating activities 247,261 251,196
INVESTING ACTIVITIES    
Purchases of property and equipment (33,483) (11,542)
Purchases and development of software (10,493) (8,063)
Acquisitions, net of cash acquired 0 (369,143)
Restricted cash 0 359,388
Other (405) 361
Net cash used for investing activities (44,381) (28,999)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 12,132 9,858
Stock tendered for payment of withholding taxes (33,133) (10,190)
Repurchase of common stock (45,248) (89,923)
Cash dividends (127,520) (114,517)
Excess tax benefit on stock-based compensation 15,104 6,040
Proceeds from short-term borrowings 2,840,000 3,893,000
Payments on short-term borrowings (2,825,000) (3,868,000)
Net cash used for financing activities (163,665) (173,732)
Effect of exchange rates on cash (361) (5,954)
Net increase in cash and cash equivalents 38,854 42,511
Cash and cash equivalents, beginning of period 168,229 128,940
Cash and cash equivalents, end of period 207,083 171,451
Noncash transactions from investing activities:    
Accrued purchases of property and equipment $ 5,359 $ 0