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Segment Information (Segment Operating Profit) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Petroleum Additives [Member]
Mar. 31, 2012
Petroleum Additives [Member]
Mar. 31, 2013
Real Estate Development [Member]
Mar. 31, 2012
Real Estate Development [Member]
Mar. 31, 2013
All Other [Member]
Mar. 31, 2012
All Other [Member]
Mar. 31, 2013
Unallocated Amount to Segment [Member]
Mar. 31, 2012
Unallocated Amount to Segment [Member]
Mar. 31, 2013
Revolving Credit Facility [Member]
Dec. 31, 2012
Revolving Credit Facility [Member]
Mar. 14, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Apr. 16, 2012
7.125% Senior Notes [Member]
Senior Notes [Member]
Segment Information [Line Items]                              
Segment operating profit $ 103,417,000 $ 109,462,000 $ 102,028,000 $ 107,154,000 $ 1,790,000 $ 1,789,000 $ (401,000) $ 519,000              
Corporate, general, and administrative expenses (40,941,000) (36,908,000)             (5,216,000) (5,505,000)          
Interest and financing expenses, net (5,109,000) (4,482,000)                          
Gain on interest rate swap agreement 678,000 [1] 1,735,000 [1]                          
Loss on early extinguishment of debt 0 [2] (3,221,000) [2]                          
Other income, net 103,000 814,000                          
Income before income tax expense 93,873,000 98,803,000                          
Maximum borrowing capacity under the revolving credit facility                     $ 650,000,000 $ 650,000,000.0 $ 650,000,000 $ 300,000,000  
Term of credit facility, years                     5 years        
Senior notes, interest rate                             7.125%
[1] The gain on interest rate swap agreement represents the change, since the beginning of the reporting period, in the fair value of an interest rate swap which we entered into on June 25, 2009. We are not using hedge accounting to record the interest rate swap, and accordingly, any change in the fair value is immediately recognized in earnings.
[2] In March 2012, we entered into a $650 million five-year unsecured revolving credit facility which replaced our previous $300 million unsecured revolving credit facility. During 2012, we used a portion of the $650 million revolving credit facility to fund the early redemption of all of our then outstanding 7.125% senior notes (7.125% senior notes), as well as to repay the outstanding principal amount on the Foundry Park I mortgage loan. As a result, during the three months ended March 31, 2012, we recognized a loss on early extinguishment of debt of $3.2 million from accelerated amortization of financing fees associated with the prior revolving credit facility and costs associated with redeeming the 7.125% senior notes prior to maturity.