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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from continuing operating activities    
Net income $ 7,066 $ 22,754
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Deferred income taxes 3,469 14,648
Gains on property insurance recoveries associated with property, plant and equipment   (5,147)
Depreciation, depletion and amortization of property, plant and equipment 19,036 17,362
Other 1,413 346
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 2,215 (6,236)
Inventories 3,711 2,963
Prepaid insurance 7,447 7,979
Prepaid and accrued income taxes 4,449 5,601
Other supplies, prepaid items and other (2,135) 744
Accounts payable (4,068) (104)
Customer deposits (5,069) (4,305)
Other current and noncurrent liabilities 2,750 648
Deferred gain on insurance recoveries   (1,383)
Net cash provided by continuing operating activities 40,284 55,870
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (157,407) (92,943)
Proceeds from property insurance recovery associated with property, plant and equipment   5,147
Proceeds from sales of property and equipment   169
Proceeds from short-term investments 14,500  
Purchases of short-term investments (25,000) (14,500)
Proceeds from noncurrent restricted cash and cash equivalents 45,969 97,984
Deposits of noncurrent restricted cash and cash equivalents   (165,106)
Proceeds from noncurrent restricted investments 25,000 209,990
Purchase of noncurrent restricted investments   (50,000)
Other investing activities (1,852) (612)
Net cash used by continuing investing activities (98,790) (9,871)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 1,800  
Payments on revolving debt facility (1,800)  
Proceeds from long-term debt, net of fees 16,047  
Payments on long-term debt (5,742) (5,240)
Payments on short-term financing (7,150) (8,165)
Payments of debt issuance costs (109)  
Proceeds from exercises of stock options 1,638 507
Excess income tax benefit associated with stock-based compensation 80  
Dividends paid on preferred stocks (300) (300)
Net cash provided (used) by continuing financing activities 4,464 (13,198)
Cash flows of discontinued operations:    
Operating cash flows (61) (92)
Net increase (decrease) in cash and cash equivalents (54,103) 32,709
Cash and cash equivalents at beginning of period 186,811 143,750
Cash and cash equivalents at end of period $ 132,708 $ 176,459