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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows provided by operating activities    
Net income $ 11,621 $ 32,206
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,527 5,384
Benefit for deferred income taxes (1,469) (759)
Change in fair value of derivative instruments 1,966 723
Impairment of fixed assets 247 382
Gain on the sale of investments (2,900) (2,089)
Losses on disposals of fixed assets 4  
Stock based compensation 204  
Noncash interest expense 13 12
Changes in operating assets and liabilities:    
Accounts receivable 7,589 (1,844)
Accounts receivable – related parties 1,938 (4,399)
Inventory (25,177) (8,634)
Income tax receivable (1,029)  
Prepaid expenses 1,052 697
Accrued interest on marketable securities 15 (200)
Other assets (110) (291)
Accounts payable (2,902) 5,452
Accounts payable – related parties 5,961 (437)
Income taxes payable   1,756
Accrued expenses and other current liabilities (202) 2,914
Accrued expenses and other current liabilities – related parties 60 100
Deferred revenue 1,434 (1,445)
Net cash provided by operating activities 2,842 29,528
Cash flows from/(used in) investing activities    
Collateralization of derivative instruments (3,337) (2,189)
Purchase of marketable securities (18,247) (21,291)
Proceeds from the sale of marketable securities 32,945 18,335
Capital expenditures (5,715) (5,733)
Net cash provided by/(used in) investing activities 5,646 (10,878)
Cash flows from/(used in) financing activities    
Proceeds from the issuance of stock   19,292
Minimum tax withholding on stock options exercised (54)  
Excess tax benefits associated with stock options 89  
Payment of dividends (10,434) (9,534)
Net cash (used in)/provided by financing activities (10,399) 9,758
Net change in cash and cash equivalents (1,911) 28,408
Cash and cash equivalents at beginning of period 86,463 58,737
Cash and cash equivalents at end of period 84,552 87,145
Cash paid for income taxes $ 7,000 $ 13,387