Goodwill and Other Intangible Assets - Goodwill and other intangible assets rollforward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill
Goodwill, beginning of period	$ 1,213,630
Goodwill acquired during the period	14,084
Goodwill, foreign currency translation	(3,200)
Goodwill, end of period	1,224,514
Intangible assets with an indefinite life
Intangible assets with an indefinite life, beginning of period	682,859
Indefinite-lived intangible assets acquired during the period	8,000
Indefinite-lived intangible assets, foreign currency translation	262
Intangible assets with an indefinite life, end of period	691,121
Intangible assets with a definite life
Intangible assets with a definite life, beginning of period	313,777
Identified definite life intangible assets	28,948
Amortization	(16,695)
Identified definite life intangible assets, foreign currency translation	(7,594)
Intangible assets with a definite life, end of period	318,436
Total
Goodwill and other intangible assets, beginning of period	2,210,266
Additions	51,032
Amortization	(16,695)
Foreign currency translation	(10,532)
Goodwill and other intangible assets, end of period	$ 2,234,071