Significant Transactions (Acquisition of Old Lyme) (Details) (Old Lyme, USD $) In Millions, unless otherwise specified	1 Months Ended
Dec. 31, 2011	Dec. 30, 2011
Old Lyme
Significant Transactions
Cash to be paid on acquisition		$ 6.0
Cash purchase price of note		2.1
Gain recognized	$ 7.2

The amount of acquisition cost of a business combination allocated to the noncurrent portion of the long-term debt assumed from the acquired entity.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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