v3.4.0.3
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities:    
Net (loss) earnings $ (8,932) $ 10,363
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 16,973 18,151
Deferred income taxes 955 6,279
Loss (gain) on asset dispositions 359 (7)
Equity in loss of unconsolidated affiliate   68
Inventory valuation reserves 2,435 562
Changes in operating assets and liabilities (28,133) (5,498)
Net cash (used in) provided by operating activities (16,343) 29,918
Investing activities:    
Purchase of property and equipment (8,519) (22,115)
Proceeds from asset dispositions 850  
Purchase of short-term investments (77,677) (190,243)
Proceeds from sale of short-term investments 76,184 185,426
Payment of deposits on aircraft (66) (66)
Net cash used in investing activities (9,228) (26,998)
Financing activities:    
Proceeds from line of credit 83,500 77,740
Payments on line of credit (53,300) (81,100)
Repurchase of common stock (500) (2,207)
Net cash provided by (used in) financing activities 29,700 (5,567)
Increase (decrease) in cash 4,129 (2,647)
Cash, beginning of period 2,407 6,270
Cash, end of period 6,536 3,623
Cash paid during the period for:    
Interest 13,691 13,453
Income taxes   3,061
Noncash investing activities:    
Other current liabilities and accrued payables related to purchase of property and equipment $ 29,302 $ 28,994