Goodwill and Other Intangible Assets - Analysis of Goodwill and intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, beginning of year	$ 1,213,630	$ 415,936	$ 396,245
Goodwill, acquired during period	14,084	807,381	25,159
Foreign currency translation, goodwill	(14,190)	(9,687)	(5,468)
Goodwill, end of year	1,213,524	1,213,630	415,936
Intangible assets with an indefinite life, beginning of year	682,859	15,366	15,366
Indefinite-lived Intangible Assets Acquired	8,000	673,000	0
Foreign currency translation, indefinite-lived intangible assets	(8,080)	(5,507)
Intangible assets with an indefinite life, end of year	682,779	682,859	15,366
Intangible assets with a definite life, beginning of year	313,777	16,650	0
Finite-lived Intangible Assets Acquired	28,948	315,000	18,500
Amortization	(22,422)	(15,517)	(1,850)
Foreign currency translation, intangible assets with an definite life	(12,953)	(2,356)
Intangible assets with a definite life, end of year	307,350	313,777	16,650
Goodwill and other intangible assets, beginning of year	2,210,266	447,952	411,611
Additions	51,032	1,795,381	43,659
Foreign currency translation, intangible assets including goodwill	(35,223)	(17,550)	(5,468)
Goodwill and other intangible assets, end of year	$ 2,203,653	$ 2,210,266	$ 447,952