Subsequent Events (Details) - shares shares in Thousands		12 Months Ended
	Feb. 08, 2017	Dec. 31, 2016	Dec. 31, 2014
Subsequent Event [Line Items]
Exercise of stock options (in shares)		7,600	40
Subsequent Event [Member]
Subsequent Event [Line Items]
Exercise of stock options (in shares)	3,800
Common Stock | Subsequent Event [Member]
Subsequent Event [Line Items]
Issuance of common stock (in shares)	1,300