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Commitments and Contingencies Commitments and Contingencies - Purchase Commitments (Details) (Land Purchases [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Land Purchases [Member]
Long-term Purchase Commitment [Line Items]
Remaining amount committed to future land purchases	$ 41.3

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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