Equity and Accumulated Other Comprehensive Loss, Net (Equity Distribution Agreements) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2011
Equity [Abstract]
Aggregate offering price of the distribution agreement maximum		$ 400,000,000
Net proceeds from sale of common stock	$ 342,700,000
Issuance of common shares (shares)	5.7
Equity distribution agreements at an average price (in dollars per share)	$ 60.35
Payment of commissions to sales agents	$ 3,500,000
Aggregate offering price remaining available for offer and sale	$ 53,800,000