Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from continuing operating activities
Net income	$ 19,634us-gaap_NetIncomeLoss	$ 54,962us-gaap_NetIncomeLoss	$ 58,604us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by continuing operating activities:
Net loss from discontinued operations	89	179	182
Deferred income taxes	12,839us-gaap_DeferredIncomeTaxExpenseBenefit	35,289us-gaap_DeferredIncomeTaxExpenseBenefit	245us-gaap_DeferredIncomeTaxExpenseBenefit
Gains on property insurance recoveries associated with property, plant and equipment	(5,147)	(66,255)
Depreciation, depletion and amortization of property, plant and equipment	35,664us-gaap_Depreciation	28,310us-gaap_Depreciation	20,681us-gaap_Depreciation
Other	5,479us-gaap_OtherNoncashIncomeExpense	4,819us-gaap_OtherNoncashIncomeExpense	4,614us-gaap_OtherNoncashIncomeExpense
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):
Accounts receivable	(7,637)	2,268	7,935
Inventories	(1,394)us-gaap_IncreaseDecreaseInInventories	8,203us-gaap_IncreaseDecreaseInInventories	(6,607)us-gaap_IncreaseDecreaseInInventories
Prepaid insurance	1,321	(5,073)	(4,096)
Prepaid and accrued income taxes	3,505	(13,278)	11,013
Other supplies, prepaid items and other	61	(4,975)	1,853
Accounts payable	(1,044)	(6,032)	980
Accrued interest	(37)	13,356	(6)
Customer deposits	1,333	(2,689)	3,684
Other current and noncurrent liabilities	2,078	4,971	389
Net cash provided by continuing operating activities	66,744	54,055	99,471
Cash flows from continuing investing activities
Expenditures for property, plant and equipment	(219,842)	(157,377)	(92,644)
Acquisition of working interests in natural gas properties		(9,205)	(50,219)
Proceeds from property insurance recovery associated with property, plant and equipment	5,147	66,437	11,415
Software and software development costs	(3,161)us-gaap_PaymentsForSoftware	(966)us-gaap_PaymentsForSoftware	(7)us-gaap_PaymentsForSoftware
Proceeds from sales of property and equipment	662	1,459	307
Proceeds from short-term investments	14,500		20,037
Purchases of short-term investments	(29,000)		(10,032)
Proceeds from noncurrent restricted cash and cash equivalents	200,111us-gaap_DecreaseInRestrictedCash
Deposits of current and noncurrent restricted cash and cash equivalents	(165,471)us-gaap_IncreaseInRestrictedCash	(80,943)us-gaap_IncreaseInRestrictedCash
Proceeds from noncurrent restricted investments	259,990
Purchases of noncurrent restricted investments	(75,000)	(209,990)
Other investing activities	41	962	(526)
Net cash used by continuing investing activities	(12,023)	(389,623)	(121,669)
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 other long-term debt, net of fees		39,825
Payments on other long-term debt	(10,473)us-gaap_RepaymentsOfOtherLongTermDebt	(12,647)us-gaap_RepaymentsOfOtherLongTermDebt	(7,019)us-gaap_RepaymentsOfOtherLongTermDebt
Payments of debt issuance costs		(1,872)us-gaap_PaymentsOfDebtIssuanceCosts	(88)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from short-term financing	14,346us-gaap_ProceedsFromShortTermDebt	16,385us-gaap_ProceedsFromShortTermDebt	11,192us-gaap_ProceedsFromShortTermDebt
Payments on short-term financing	(16,140)us-gaap_RepaymentsOfShortTermDebt	(11,890)us-gaap_RepaymentsOfShortTermDebt	(7,584)us-gaap_RepaymentsOfShortTermDebt
Proceeds from revolving debt facility			209,238us-gaap_ProceedsFromLinesOfCredit
Payments on revolving debt facility			(209,238)us-gaap_RepaymentsOfLinesOfCredit
Payments on loans secured by cash value of life insurance policies			(1,918)us-gaap_RepaymentsOfSecuredDebt
Proceeds from exercises of stock options	1,074	1,014	767
Excess income tax benefit associated with stock-based compensation			498
Acquisition of redeemable preferred stock			(39)
Dividends paid on preferred stocks	(300)	(300)	(300)
Net cash provided (used) by continuing financing activities	(11,493)	381,472	(4,491)
Cash flows of discontinued operations:
Operating cash flows	(167)	(174)	(220)
Net increase (decrease) in cash and cash equivalents	43,061	45,730	(26,909)
Cash and cash equivalents at beginning of year	143,750	98,020	124,929
Cash and cash equivalents at end of year	$ 186,811	$ 143,750	$ 98,020

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

+ Details

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

+ Details

Name:	us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

+ References

+ Details

Name:	us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

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Name:	us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale of investments that are pledged or subject to withdrawal restrictions during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration