Goodwill and Other Intangibles (Changes in Net Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, beginning balance	$ 757,142	$ 756,384
Change in goodwill	28,257	758
Goodwill, ending balance	$ 785,399	$ 757,142