Capital Stock - Narrative (Details) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Common Stock [Abstract]
Common Stock Shares Authorized	500,000,000	500,000,000
Common Stock Par Or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock [Abstract]
Preferred Shares Authorized	100,000,000	100,000,000
Preferred Stock Par Or Stated Value Per Share	$ 0.01	$ 0.01
Ownership Limitations [Abstract]
Stock Ownership Limit	9.80%