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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 $ 37,110 $ 27,949
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,765 3,764
Stock-based compensation 2,295 1,965
(Gain) loss on disposal of property, plant and equipment (22) 258
Changes in operating assets and liabilities:    
Accounts receivable (139,643) (123,249)
Inventories (7,928) (1,563)
Prepaid expenses and other assets 118 2,304
Accounts payable 13,770 2,876
Accrued expenses and other liabilities (18,972) (13,939)
Income taxes receivable/payable 10,399 13,191
Net cash used in operating activities (98,108) (86,444)
Investing Activities    
Expenditures for property, plant and equipment (5,435) (4,312)
Proceeds from sales of property, plant and equipment 24  
Net cash used in investing activities (5,411) (4,312)
Financing Activities    
Borrowings under line of credit 92,500 93,000
Principal payments under line of credit (8,000) (16,000)
Repurchases of common stock (8,993) (3,244)
Proceeds from employee stock purchase and option plans 197 103
Net cash provided by financing activities 75,704 73,859
Net decrease in cash and cash equivalents (27,815) (16,897)
Cash and cash equivalents, beginning of period 30,514 18,664
Cash and cash equivalents, end of period 2,699 1,767
Supplemental Disclosure:    
Cash paid for interest 62 64
Cash paid for income taxes, net $ (21) $ 556