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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
OPERATING ACTIVITIES    
Net income $ 330,968 $ 301,460
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 49,642 48,479
Provision for doubtful accounts 3,224 9,055
Stock-based compensation 31,807 44,704
Deferred income taxes (5,322) (9,014)
Excess tax benefit on stock-based compensation (5,353) (7,502)
Other operating activities 961 668
Changes in operating elements (net of acquisitions):    
Receivables 89,175 (214,620)
Contract assets (19,380) (34,483)
Prepaid expenses and other (16,404) 5,326
Accounts payable and outstanding checks 37,378 101,770
Accrued compensation (60,976) (7,381)
Accrued transportation expense 19,149 45,420
Accrued income taxes (3,051) 12,068
Other accrued liabilities 4,166 9,277
Other assets and liabilities 542 3,243
Net cash provided by operating activities 456,526 308,470
INVESTING ACTIVITIES    
Purchases of property and equipment (16,774) (20,569)
Purchases and development of software (14,790) (9,514)
Acquisitions, net of cash acquired (58,379) (1,315)
Other investing activities 8 (1,546)
Net cash used for investing activities (89,935) (32,944)
FINANCING ACTIVITIES    
Proceeds from stock issued for employee benefit plans 27,952 35,846
Stock tendered for payment of withholding taxes (12,680) (18,893)
Repurchase of common stock (173,622) (119,497)
Cash dividends (139,010) (130,559)
Proceeds from long-term borrowings 473,000 591,012
Payments on long-term borrowings (561,000) 0
Proceeds from short-term borrowings 14,000 2,418,000
Payments on short-term borrowings (19,000) (3,067,000)
Net cash used for financing activities (390,360) (291,091)
Effect of exchange rates on cash 461 (7,750)
Net change in cash and cash equivalents (23,308) (23,315)
Cash and cash equivalents, beginning of period 378,615 333,890
Cash and cash equivalents, end of period 355,307 310,575
Noncash transactions from financing activities:    
Accrued share repurchases held in other accrued liabilities $ 3,860 $ 2,400