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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from continuing operating activities    
Net loss $ (33,097) $ (13,019)
Adjustments to reconcile net loss to net cash provided by continuing operating activities:    
Deferred income taxes 3,442 (4,004)
Loss on extinguishment of debt 5,951  
Depreciation, depletion and amortization of property, plant and equipment 36,666 34,162
Amortization of intangible and other assets 1,197 927
Loss on sales of a business and other property and equipment 474 4,158
Other 3,930 1,943
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 6,927 (8,243)
Inventories 7,343 7,760
Prepaid insurance 5,772 6,160
Prepaid and accrued income taxes 943 (1,040)
Accounts payable 1,867 (2,364)
Accrued interest (6,333) (14)
Other assets and other liabilities (1,738) (3,485)
Net cash provided by continuing operating activities 33,344 22,941
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (15,369) (16,362)
Net proceeds from sale of businesses and other property and equipment 641 18,842
Proceeds from property insurance recovery associated with property, plant and equipment 1,531  
Net proceeds from sale of discontinued operations 2,730  
Other investing activities 115 952
Net cash provided (used) by continuing investing activities (10,352) 3,432
Cash flows from continuing financing activities    
Proceeds from 9.625% senior secured notes, net of discount and fees 390,473  
Payments on senior secured notes (375,000)  
Payments on other long-term debt (6,055) (10,653)
Payments of debt-related costs (9,805) (90)
Payments on short-term financing (6,105) (6,522)
Payments of preferred stock modification costs (2,677)  
Taxes paid on equity awards (226) (67)
Net cash used by continuing financing activities (9,395) (17,332)
Cash flows of discontinued operations:    
Net cash used by operating activities 0 (1,714)
Net cash used by financing activities 0 (131)
Net cash used by discontinued operations 0 (1,845)
Net increase in cash and cash equivalents 13,597 7,196
Cash and cash equivalents at beginning of period 33,619 60,017
Cash and cash equivalents at end of period $ 47,216 $ 67,213