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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from continuing operating activities    
Net income (loss) $ (13,019) $ 150
Adjustments to reconcile net income (loss) to net cash provided (used) by continuing operating activities:    
Income from discontinued operations, including taxes   (23,603)
Deferred income taxes (4,004) (8,633)
Loss on sales of a business and other property and equipment 4,158 660
Depreciation, depletion and amortization of property, plant and equipment 34,162 24,618
Other 2,870 615
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable (8,243) (4,233)
Inventories 7,760 7,352
Prepaid insurance 6,160 4,566
Prepaid and accrued income taxes (1,040) (576)
Other supplies, prepaid items and other (2,471) (561)
Accounts payable (2,364) 17,664
Other current and noncurrent liabilities (1,028) 6,225
Net cash provided by continuing operating activities 22,941 24,244
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (16,362) (170,057)
Net proceeds from sale of a business and other property and equipment 18,842 78
Other investing activities 952 980
Net cash provided (used) by continuing investing activities 3,432 (168,999)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility   55,907
Payments on revolving debt facility   (25,000)
Proceeds from other long-term debt, net of fees   14,751
Payments on other long-term debt (10,653) (7,639)
Payments of debt issuance costs (90) (543)
Payments of issuance costs relating to preferred stocks and warrants   (785)
Payments on short-term financing (6,522) (4,783)
Proceeds from exercises of stock options   371
Other financing activities (67)  
Net cash provided (used) by continuing financing activities (17,332) 32,279
Cash flows of discontinued operations:    
Net cash provided (used) by operating activities (1,714) 10,512
Net cash used by investing activities   (1,025)
Net cash used by financing activities (131) (1,370)
Net cash provided (used) by discontinued operations (1,845) 8,117
Net increase (decrease) in cash and cash equivalents 7,196 (104,359)
Cash and cash equivalents at beginning of period 60,017 127,195
Cash and cash equivalents at end of period $ 67,213 $ 22,836