Common Stock (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Dividends, Common Stock [Abstract]
Dividends, Common Stock, Cash	$ 12,500	$ 11,900	$ 37,021	$ 35,138	$ 49,000	$ 46,400