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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

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