Summary of Critical and Significant Accounting Policies Summary of Critical and Significant Accounting Policies - Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at January 1,	$ 45,452	$ 23,256	$ 0
Reset of previous year redemptions	(768)	22,196	18,505
Redemptions	0	0	0
Additions	0	0	4,751
Balance at December 31,	$ 44,684	$ 45,452	$ 23,256