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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows provided by operating activities    
Net income $ 6,274 $ 14,050
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 2,360 2,658
Benefit for deferred income taxes (1,724) (982)
Change in fair value of derivative instruments 404 941
Impairment of fixed assets   382
Loss/(gain) on the sale of investments 49 (59)
Losses on disposals of fixed assets 5  
Noncash interest expense 6 6
Changes in operating assets and liabilities:    
Accounts receivable 11,247 (5,121)
Accounts receivable – related parties 504 (4,485)
Inventory (319) (28,710)
Income tax receivable 5,240  
Prepaid expenses 346 172
Prepaid expenses – related party 187  
Accrued interest on marketable securities   109
Other assets (179) (56)
Accounts payable (2,532) 9,237
Accounts payable – related parties 8,198 (46)
Income taxes payable   4,288
Accrued expenses and other current liabilities (634) 916
Accrued expenses and other current liabilities – related parties 28 50
Deferred revenue 1,998 (685)
Net cash provided by/(used in) operating activities 31,458 (7,335)
Cash flows from investing activities    
Collateralization of derivative instruments (1,435) (1,605)
Purchase of marketable securities (7,677) (3,399)
Proceeds from the sale of marketable securities 388 3,606
Capital expenditures (2,682) (2,318)
Net cash used in investing activities (11,406) (3,716)
Cash flows from 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 44  
Payment of dividends (5,201) (4,767)
Net cash (used in)/provided by financing activities (5,211) 14,525
Net change in cash and cash equivalents 14,841 3,474
Cash and cash equivalents at beginning of period 86,463 58,737
Cash and cash equivalents at end of period 101,304 62,211
Cash paid for income taxes $ 162 $ 581