Stockholders' Equity (Deficit) (Details)	12 Months Ended
	Dec. 31, 2016 item $ / shares shares	Dec. 31, 2015 $ / shares shares
Stockholders Equity (Deficit)
Common stock, par value (in dollars per share) | $ / shares	$ 86.08
Preferred Stock, shares authorized	20,000,000
Preferred Stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred Stock, shares outstanding	0
Class A common stock
Stockholders Equity (Deficit)
Common stock, shares authorized	1,600,000,000	1,600,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common stock, shares outstanding	226,812,205	225,748,624
Votes per share		Class A
Class B common stock
Stockholders Equity (Deficit)
Common stock, shares authorized	800,000,000	800,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares outstanding	238,435,208	238,435,208
Votes per share	10
Number of shares of Class A common stock into which each share of common stock is convertible	1
Class C common stock
Stockholders Equity (Deficit)
Common stock, shares authorized	800,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares outstanding	0
Votes per share	one
Number of shares of Class A common stock into which each share of common stock is convertible		1
Votes per share in the event of change of control | item	10