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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES      
Net income $ 513,384 $ 509,699 $ 449,711
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 74,669 66,409 57,009
Provision for doubtful accounts 5,136 11,538 15,092
Stock-based compensation 37,565 57,661 47,861
Gain on divestiture 0 0 (1,848)
Deferred income taxes 15,009 (17,095) (3,117)
Other 1,907 7,409 710
Changes in operating elements, net of effects of acquisitions:      
Receivables (173,211) 107,560 (137,102)
Prepaid expenses and other (6,378) (228) 6,294
Other non-current assets (3,934) 741 380
Accounts payable and outstanding checks 115,917 (53,272) 40,251
Accrued compensation (47,570) 18,580 40,236
Accrued income taxes 1,459 5,178 (4,370)
Other accrued liabilities (4,545) 4,156 2,319
Net cash provided by operating activities 529,408 718,336 513,426
INVESTING ACTIVITIES      
Purchases of property and equipment (73,452) (28,115) (22,364)
Purchases and development of software (17,985) (16,527) (7,138)
Acquisitions, net of cash acquired (220,203) (369,833) 0
Restricted cash 0 359,388 (359,388)
Other (1,348) 641 (6)
Net cash used for investing activities (312,988) (54,446) (388,896)
FINANCING ACTIVITIES      
Proceeds from stock issued for employee benefit plans 19,271 15,557 11,942
Stock tendered for payment of withholding taxes (36,678) (11,368) (12,604)
Repurchase of common stock (172,925) (229,863) (164,041)
Cash dividends (245,430) (235,615) (215,008)
Excess tax benefit on stock-based compensation 18,462 8,548 7,558
Proceeds from short-term borrowings 6,600,000 6,833,000 4,823,000
Payments on short-term borrowings (6,310,000) (6,988,000) (4,593,000)
Debt issuance costs 0 0 (1,484)
Net cash used for financing activities (127,300) (607,741) (143,637)
Effect of exchange rates on cash (9,683) (16,860) (14,000)
Net change in cash and cash equivalents 79,437 39,289 (33,107)
Cash and cash equivalents, beginning of year 168,229 128,940 162,047
Cash and cash equivalents, end of year 247,666 168,229 128,940
Supplemental cash flow disclosures      
Cash paid for income taxes 269,187 311,800 271,979
Cash paid for interest 28,908 28,537 27,066
Accrued share repurchases held in other accrued liabilities $ 5,988 $ 2,250 $ 0