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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from continuing operating activities    
Net income $ 150 $ 7,066
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Income from discontinued operations, including taxes (23,603) (5,703)
Deferred income taxes (8,633) 2,503
Depreciation, depletion and amortization of property, plant and equipment 24,618 16,711
Other 1,275 540
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable (4,233) 3,105
Inventories 7,352 2,965
Prepaid insurance 4,566 6,420
Prepaid and accrued income taxes (576) 4,449
Other supplies, prepaid items and other (561) (2,369)
Accounts payable 17,664 (3,292)
Customer deposits (558) (3,989)
Other current and noncurrent liabilities 6,783 314
Net cash provided by continuing operating activities 24,244 28,720
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (170,057) (156,981)
Proceeds from short-term investments   14,500
Purchases of short-term investments   (25,000)
Proceeds from noncurrent restricted cash and cash equivalents   45,969
Proceeds from noncurrent restricted investments   25,000
Other investing activities 1,058 (566)
Net cash used by continuing investing activities (168,999) (97,078)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 55,907 1,800
Payments on revolving debt facility (25,000) (1,800)
Proceeds from other long-term debt, net of fees 14,751 16,047
Payments on other long-term debt (7,639) (5,742)
Payments of debt issuance costs (543) (109)
Payments of issuance costs relating to preferred stocks and warrants (785)  
Payments on short-term financing (4,783) (6,324)
Proceeds from exercises of stock options 371 1,638
Excess income tax benefit associated with stock-based compensation   80
Dividends paid on convertible preferred stocks   (300)
Net cash provided by continuing financing activities 32,279 5,290
Cash flows of discontinued operations:    
Net cash provided by operating activities 10,512 13,436
Net cash used by investing activities (1,025) (1,887)
Net cash used by financing activities (1,370) (826)
Net cash provided by discontinued operations 8,117 10,723
Net decrease in cash and cash equivalents (104,359) (52,345)
Cash and cash equivalents at beginning of period 127,195 184,996
Cash and cash equivalents at end of period $ 22,836 $ 132,651