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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES    
Net income $ 142,297 $ 122,080
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 24,241 22,431
Provision for doubtful accounts 6,630 3,618
Stock-based compensation 18,134 12,318
Deferred income taxes (26) (2,048)
Excess tax benefit on stock-based compensation (6,224) (9,344)
Loss on sale/disposal of assets 323 485
Changes in operating elements (net of acquisitions):    
Receivables (10,056) (95,204)
Contract assets (13,264) 0
Prepaid expenses and other 6,327 (6,049)
Other non-current assets 1,093 (1,016)
Accounts payable and outstanding checks 21,797 47,201
Accrued transportation expense 17,109 0
Accrued compensation (37,867) (37,864)
Accrued income taxes 35,184 51,949
Other accrued liabilities (5,128) (15,861)
Net cash provided by operating activities 200,570 92,696
INVESTING ACTIVITIES    
Purchases of property and equipment (11,719) (13,537)
Purchases and development of software (3,744) (3,183)
Acquisitions, net of cash acquired 0 (1,780)
Other (726) 56
Net cash used for investing activities (16,189) (18,444)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 24,497 15,823
Stock tendered for payment of withholding taxes (18,091) (18,955)
Repurchase of common stock (47,700) (28,999)
Cash dividends (65,382) (64,597)
Proceeds from short-term borrowings 2,119,000 2,450,000
Payments on short-term borrowings (2,183,000) (2,450,000)
Net cash used for financing activities (170,676) (96,728)
Effect of exchange rates on cash 2,187 4,604
Net change in cash and cash equivalents 15,892 (17,872)
Cash and cash equivalents, beginning of period 333,890 247,666
Cash and cash equivalents, end of period 349,782 229,794
Noncash transactions from investing and financing activities:    
Accrued share repurchases held in other accrued liabilities 4,000 3,000
Accrued purchases of property and equipment $ 449 $ 1,404