Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 6,764	$ 6,992	$ 5,885
Accumulated depreciation and amortization	$ 897,802	$ 886,268	$ 865,852
Common stock, par value	$ 2.25	$ 2.25	$ 2.25
Common stock, shares authorized	40,000,000us-gaap_CommonStockSharesAuthorized	40,000,000us-gaap_CommonStockSharesAuthorized	40,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	26,781,785us-gaap_CommonStockSharesIssued	26,781,785us-gaap_CommonStockSharesIssued	26,781,785us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	26,781,785us-gaap_CommonStockSharesOutstanding	26,781,785us-gaap_CommonStockSharesOutstanding	26,781,785us-gaap_CommonStockSharesOutstanding

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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