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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows provided by operating activities    
Net income $ 7,113 $ 2,716
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,584 1,911
Benefit from deferred income taxes (161) (1,478)
Change in fair value of derivative instruments and marketable securities (1,266) (2)
(Gain)/loss on investments (314) 69
Losses on disposals of fixed assets 63 6
Noncash interest expense 6 6
Changes in operating assets and liabilities:    
Accounts receivable 13,607 8,114
Accounts receivable – related parties (47) (22)
Inventory (10,513) (3,827)
Income taxes receivable   519
Prepaid expenses 216 (22)
Accrued interest on marketable securities   (96)
Other assets 15 153
Accounts payable 2,776 7,853
Accounts payable – related parties (2,694) 14
Income taxes payable 3,198 1,730
Accrued expenses and other current liabilities 317 47
Accrued expenses and other current liabilities – related parties (26) (2)
Deferred revenue (891) 5,277
Net cash provided by operating activities 13,983 22,966
Cash flows from investing activities    
Restricted cash   16,400
Proceeds from the sale of fixed assets 31  
Collateralization of derivative instruments 1,050 (199)
Purchase of marketable securities (17,406) (58,311)
Proceeds from the sale of marketable securities 7,648 19,577
Capital expenditures (2,113) (8,163)
Net cash used in investing activities (10,790) (30,696)
Cash flows from financing activities    
Proceeds from the issuance of stock 72 35
Excess tax benefits associated with stock options 8  
Payment of dividend (4,132) (3,999)
Net cash used in financing activities (4,052) (3,964)
Net change in cash and cash equivalents (859) (11,694)
Cash and cash equivalents at beginning of period 89,745 91,057
Cash and cash equivalents at end of period 88,886 79,363
Cash paid for interest   3
Cash paid for income taxes 2,090 465
Non-cash capital expenditures   $ 535