Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Goodwill) (Narrative) (Details) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016 USD ($) business	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 1,603	$ 0	$ 0	$ 0		$ 1,603	$ 251,401
Other Businesses [Member]
Goodwill [Line Items]
Number of businesses recorded impairment of goodwill | business	1
Goodwill, Impairment Loss	$ 1,600				$ 2,800	1,603	2,810
Education [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss						$ 0	$ 248,591