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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating Activities    
Net income $ 23,402 $ 17,553
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 3,829 3,636
Stock-based compensation 1,276 1,454
Gain on disposal of property, plant and equipment (104)  
Excess tax benefits from stock compensation (363) (1,035)
Changes in operating assets and liabilities:    
Accounts receivable (108,939) (100,602)
Inventories (2,556) 827
Prepaid expenses and other assets (1,577) 888
Accounts payable (666) (7,265)
Accrued expenses and other liabilities (11,327) (5,666)
Income taxes receivable/payable 12,542 9,166
Net cash used in operating activities (84,483) (81,044)
Investing Activities    
Expenditures for property, plant and equipment (2,439) (9,060)
Proceeds from sales of property, plant and equipment 4,249  
Purchase of acquired company, net of cash acquired   (31)
Net cash provided by (used in) investing activities 1,810 (9,091)
Financing Activities    
Borrowings under line of credit 148,500 84,000
Principal payments under line of credit (14,000)  
Repurchases of common stock (53,968) (2,015)
Financing costs (485)  
Proceeds from employee stock purchase and option plans 72 127
Excess tax benefits from stock compensation 363 1,035
Net cash provided by financing activities 80,482 83,147
Net decrease in cash and cash equivalents (2,191) (6,988)
Cash and cash equivalents, beginning of period 5,995 9,544
Cash and cash equivalents, end of period 3,804 2,556
Supplemental Disclosure:    
Cash paid for interest 248 59
Cash paid for income taxes, net $ 498 $ 799