Summary of Significant Accounting Policies - Goodwill and Indefinite-lived Intangibles Impairment (Details 9) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Impairment of Long-Lived Assets and Long-lived Assets to be Disposed of
Goodwill, loss	$ 0	$ 0	$ 0