Goodwill (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill [Abstract]

Schedule of Goodwill

	2013			2014
Beginning balance	$	4,628		$	29,509
Goodwill acquired in acquisitions of business		24,992			316,492
Exchange rate differences		(111	)		(1,371	)
Ending balance	$	29,509		$	344,630