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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 18,679,000 $ 14,011,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 7,912,000 8,219,000
Realized gain on investment securities, net (337,000) (4,000)
Share-based compensation 1,772,000 1,816,000
Deferred income taxes (47,000) (440,000)
Loss on disposal of fixed assets 85,000 59,000
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable 216,000 (1,255,000)
Inventory 3,353,000 1,690,000
Prepaid expenses and other current assets 1,261,000 (19,000)
Other assets 764,000 219,000
Accounts payable and accrued expenses 2,117,000 10,603,000
Income taxes (1,682,000) 4,828,000
Net cash provided by operating activities 34,093,000 39,727,000
Cash Flow from Investing Activities:    
Sale of investment securities 7,416,000 7,140,000
Purchase of investment securities (21,576,000) (6,802,000)
Purchase of property and equipment (8,644,000) (7,435,000)
Net cash used in investing activities (22,804,000) (7,097,000)
Cash Flow from Financing Activities:    
Repayment of long-term debt and capital leases (3,587,000) (1,297,000)
Decrease in note receivable 19,000 13,000
Excess tax benefits from share-based compensation 322,000 567,000
Purchase of treasury stock 0 (2,764,000)
Net cash used in financing activities (3,246,000) (3,481,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 8,043,000 29,149,000
Cash and cash equivalents - beginning of the period 39,937,000 14,262,000
Cash and cash equivalents - end of period 47,980,000 43,411,000
Supplemental disclosure of cash flow information:    
Interest paid 49,000 93,000
Income taxes paid 10,143,000 2,249,000
Supplemental disclosure of non cash activity:    
Capitalized lease additions $ 0 $ 104,000