Goodwill (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, plant and equipment [Line Items]
Fair value inputs discount rate, range bottom	6.00%
Fair value inputs, discount rate, range top	11.00%
Fair Value Inputs, Long-term Revenue Growth Rate	3.00%
Goodwill, Impairment Loss	$ 0	$ 0	$ 0

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