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Intangible Assets (Details) (USD $)	12 Months Ended
Intangible Assets (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets, Net [Abstract]
Intangible asset amortization period	5 years
Carrying amount of the intangible asset	$ 3,159,000	$ 5,266,000
Gross value of the intangible asset	12,400,000
Intangible asset accumulated amortization	9,300,000
Intangible asset amortized in 2012	$ 2,100,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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