Summary of Major Accounting Policies - Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Goodwill, Impairment Loss		$ 0
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	13 years

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details