Long-term Debt and Capital Lease Obligations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014	Jun. 19, 2014
Debt Instrument [Line Items]
Long-term debt gross	$ 279,864us-gaap_DebtAndCapitalLeaseObligations	$ 268,978us-gaap_DebtAndCapitalLeaseObligations
Less current installments	3,511	3,424
Long-term debt and capital lease obligations, less current installments	276,353	265,554
Second Priority Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt gross	245,000	245,000	245,000
Fixed interest rate (in hundredths)	7.375%
Revolver Under Credit Agreement, Variable [Member]
Debt Instrument [Line Items]
Long-term debt gross	11,500	0
Missouri IRBs [Member]
Debt Instrument [Line Items]
Long-term debt gross	7,228	7,334
Fixed interest rate (in hundredths)	2.80%	2.80%
Capital Leases [Member]
Debt Instrument [Line Items]
Long-term debt gross	12,890	13,288
Fixed interest rate, minimum (in hundredths)	2.04%	2.04%
Fixed interest rate, maximum (in hundredths)	7.73%	7.73%
Notes Payable [Member]
Debt Instrument [Line Items]
Long-term debt gross	$ 3,246	$ 3,356
Fixed interest rate, maximum (in hundredths)	2.56%	2.56%

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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