Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 138,575	$ 92,563	$ 94,445
Other comprehensive loss, net of income tax:
Foreign currency translation adjustment	(40,776)	(35,796)	(13,442)
Total comprehensive income	97,799	56,767	81,003
Total comprehensive income attributable to:
Shareholders	95,831	55,295	80,202
Non-controlling interests	$ 1,968	$ 1,472	$ 801