Goodwill and Other Intangible Assets - Goodwill and other intangible assets rollforward (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill
Goodwill, beginning of period	$ 1,213,630
Goodwill acquired during the period	14,084
Goodwill, foreign currency translation	(3,149)
Goodwill, end of period	1,224,565
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	215
Intangible assets with an indefinite life, end of period	691,074
Intangible assets with a definite life
Intangible assets with a definite life, beginning of period	313,777
Identified definite life intangible assets	6,000
Amortization	(11,342)
Identified definite life intangible assets, foreign currency translation	(6,101)
Intangible assets with a definite life, end of period	302,334
Total
Goodwill and other intangible assets, beginning of period	2,210,266
Additions	28,084
Amortization	(11,342)
Foreign currency translation	(9,035)
Goodwill and other intangible assets, end of period	$ 2,217,973