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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash Flows from Operating Activities:    
Net income $ 9,063 $ 8,584
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,416 2,192
Stock-based compensation expense 289 238
Deferred income taxes 34 67
Excess tax benefit from exercise of equity awards (32) (59)
Provision for doubtful accounts (103) 733
Changes in assets and liabilities:    
Accounts receivable 67,942 7,443
Inventories 5,431 19,643
Prepaid expenses and other current assets (1,928) (2,957)
Other non-current assets (128) 51
Accounts payable (52,359) (8,627)
Accrued expenses and other liabilities (7,156) (6,093)
Net cash provided by operating activities 23,469 21,215
Cash Flows from Investing Activities:    
Purchases of property and equipment (2,078) (2,278)
Net cash used for investing activities (2,078) (2,278)
Cash Flows from Financing Activities:    
Dividend payment (10,591)  
Excess tax benefit from exercise of equity awards 32 59
Exercise of stock options   20
Payment of payroll taxes on stock-based compensation through shares withheld (40) (43)
Net cash (used for) provided by financing activities (10,599) 36
Increase in cash and cash equivalents 10,792 18,973
Cash and cash equivalents, beginning of period 80,188 60,909
Cash and cash equivalents, end of period 90,980 79,882
Non-cash Investing and Financing Activities:    
Accrued capital expenditures 578 149
Supplemental Cash Flow Information:    
Income taxes paid $ 7,638 $ 8,818