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Acquisitions of Businesses and Non-controlling Interests, Changes in the carrying amount of redeemable non-controlling interest (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Acquisitions of Businesses and Non-controlling Interests [Abstract]
Beginning balance	$ 4,104
Increase due to revaluation and operating results of redeemable non-controlling interests	1,784
Reclass of non controlling interest	6,375
Purchases of redeemable non-controlling interests	(4,887)
Ending balance	$ 7,376

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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