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Receivables (Narrative) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Land Note [Member]	Mar. 31, 2013 Land Note [Member] Maturity Date, March 31, 2014 [Member]	Mar. 31, 2013 Land Note [Member] Maturity Date, March 31, 2015 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable	$ 69,855	$ 34,917		$ 67,300	$ 33,700
Interest rate on Land Note, start			1.00%
Interest rate on Land Note, end			1.50%

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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