Investments (Schedule Of Available-For-Sale Securities Investments Results)(Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale equity securities, amoritzed cost	$ 8,260,000	$ 10,888,000
Available-for-sales securities, gross unrealized gains	16,500,000	6,520,000
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities	24,760,000	17,408,000
Deferred taxes on unrealized holdings gains	6,600,000	2,608,000
Unrealized gains recorded in equity, net of deferred tax	9,900,000	3,912,000
Cement Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale equity securities, amoritzed cost	4,190,000	5,985,000
Available-for-sales securities, gross unrealized gains	8,290,000	2,765,000
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities	12,480,000	8,750,000
General Buiding Materials Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale equity securities, amoritzed cost	3,600,000	3,819,000
Available-for-sales securities, gross unrealized gains	2,150,000	765,000
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities	5,750,000	4,584,000
Oil And Gas Refining And Marketing Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale equity securities, amoritzed cost	470,000	782,000
Available-for-sales securities, gross unrealized gains	6,060,000	2,850,000
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities	6,530,000	3,632,000
Residential Construction Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale equity securities, amoritzed cost		302,000
Available-for-sales securities, gross unrealized gains		140,000
Available-for-sale securities, gross unrealized losses		0
Available-for-sale securities		$ 442,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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