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Supplemental Guarantors Consolidating Condensed Financial Information - (Narrative) (Details) (Senior Notes [Member], 9½% Senior Notes [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Mar. 20, 2013
Senior Notes [Member] | 9½% Senior Notes [Member]
    
Face amount of senior notes   $ 250.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cik0000750813_SeniorNoteNinePointFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Interest rate of senior notes 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cik0000750813_SeniorNoteNinePointFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cik0000750813_SeniorNoteNinePointFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember