Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				9 Months Ended
	Mar. 02, 2016	Feb. 26, 2016	Feb. 22, 2016	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Shares issued during period (in shares)	6,600,000.0		44,000,000
Price of share sold (in USD per share)			$ 19.675
Sale of common stock, net	$ 129,900	$ 865,700		$ 995,279	$ 0