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Intangible Assets, net (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortization Expenses
Amortization of Intangible Assets	$ 838	$ 695	$ 557
Referral Relationship [Member]
Amortization Expenses
Amortization of Intangible Assets	433	305	213
Non Compete Agreements [Member]
Amortization Expenses
Amortization of Intangible Assets	$ 405	$ 390	$ 344

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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