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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows provided by operating activities    
Net income $ 41,877 $ 4,230
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 5,512 5,808
Amortization of deferred financing costs 72 72
Benefit for deferred income taxes (3,885) (1,763)
Change in fair value of equity securities 6,412 [1]
Change in fair value of derivative instruments (1,559) 318
Other than temporary impairment of marketable securities 177
Impairment of fixed assets 171 9
Gain on the sale of investments (2,324) 392
Stock based compensation 214 750
Losses on disposals of fixed assets 37 77
Noncash interest expense 14 13
Changes in operating assets and liabilities:    
Accounts receivable (417) 5,613
Accounts receivable – related parties (11) (2,573)
Inventory (3,767) 15,204
Income tax receivable 3,456 4,262
Prepaid expenses 706 626
Prepaid expenses – related parties (7)
Accrued interest on marketable securities (82) (11)
Other assets 39 19
Accounts payable 16,316 (5,150)
Accounts payable - related parties (402) 525
Accrued expenses and other current liabilities 4,584 1,370
Accrued expenses and other current liabilities - related parties (142)
Deferred revenue (1,603) (1,972)
Other noncurrent liabilities 112
Net cash provided by operating activities 65,360 27,959
Cash flows from investing activities    
Collateralization of derivative instruments 1,237 (34)
Purchase of marketable securities (10,690) (19,322)
Proceeds from the sale of marketable securities 35,718 10,268
Proceeds from the sale of fixed assets 20
Capital expenditures (1,103) (1,686)
Net cash provided by/(used in) investing activities 25,182 (10,774)
Cash flows from financing activities    
Minimum tax withholding on stock options exercised and awards vested (8)
Excess tax benefits associated with stock options and awards (1)
Payment of dividends (5,248) (105,438)
Net cash used in financing activities (5,248) (105,447)
Net change in cash and cash equivalents 85,294 (88,262)
Cash and cash equivalents at beginning of period 114,627 199,272
Cash and cash equivalents at end of period 199,921 111,010
Cash paid for interest
Cash paid for income taxes $ 759 $ 55
[1] Prior periods have not been adjusted under the modified retrospective method for Topic 321.