CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from continuing operating activities
Net income	$ 18,977	$ 17,619
Adjustments to reconcile net income to net cash provided by continuing operating activities:
Net loss from discontinued operations	28	49
Deferred income taxes	11,542	6,170
Gains on property insurance recoveries associated with property, plant and equipment	(5,147)
Depreciation, depletion and amortization of property, plant and equipment	26,421	20,062
Other	2,433	5,008
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):
Accounts receivable	(7,326)	(317)
Inventories	(917)	5,446
Prepaid insurance	11,619	8,364
Prepaid and accrued income taxes	5,593	(9,459)
Other supplies, prepaid items and other	1,454	(5,525)
Accounts payable	5,160	(7,141)
Accrued interest	(8,131)	5,581
Other current and noncurrent liabilities	(4,807)	(579)
Net cash provided by continuing operating activities	56,899	45,278
Cash flows from continuing investing activities
Expenditures for property, plant and equipment	(164,160)	(113,727)
Acquisition of working interests in natural gas properties		(9,205)
Proceeds from property insurance recovery associated with property, plant and equipment	5,147	23,671
Proceeds from sales of property and equipment	220	1,439
Purchase of short-term investments	(14,500)
Proceeds from noncurrent restricted cash and cash equivalents	169,276
Deposits of current and noncurrent restricted cash and cash equivalents	(165,106)	(110,015)
Proceeds from noncurrent restricted investments	209,990
Purchase of noncurrent restricted investments	(50,000)	(169,988)
Other investing activities	(1,814)	(818)
Net cash used by continuing investing activities	(10,947)	(378,643)
Cash flows from continuing financing activities
Proceeds from senior secured notes, net of pay off of secured term loan and fees		350,957
Proceeds from long-term debt, net of fees		39,825
Payments on long-term debt	(7,853)	(6,657)
Payments of debt issuance costs		(1,607)
Payments on short-term financing	(12,236)	(8,351)
Proceeds from exercise of stock options	649	865
Excess income tax benefit associated with stock-based compensation		411
Dividends paid on preferred stocks	(300)	(300)
Net cash provided (used) by continuing financing activities	(19,740)	375,143
Cash flows of discontinued operations:
Operating cash flows	(138)	(145)
Net increase (decrease) in cash and cash equivalents	26,074	41,633
Cash and cash equivalents at beginning of period	143,750	98,020
Cash and cash equivalents at end of period	$ 169,824	$ 139,653