Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Discontinued Operations [Member]	Sep. 30, 2014 Cable [Member] Wireless Licenses [Member]	Jun. 30, 2014 Kaplan International [Member] Kaplan China [Member] Discontinued Operations [Member]
Amortized Intangible Assets [Line Items]
Impairment of intangible assets			$ 7,774,000	$ 0	$ 7,800,000		$ 7,800,000
Amortization of Intangible Assets
Amortization of intangible assets	7,405,000	2,468,000	13,117,000	8,780,000
Estimated amortization of intangible assets, remainder of 2014	4,000,000		4,000,000
Estimated amortization of intangible assets, 2015	17,000,000		17,000,000
Estimated amortization of intangible assets, 2016	16,000,000		16,000,000
Estimated amortization of intangible assets, 2017	12,000,000		12,000,000
Estimated amortization of intangible assets, 2018	10,000,000		10,000,000
Estimated amortization of intangible assets, after 2018	19,000,000		19,000,000
Indefinite-Lived Intangible Assets [Line Items]
Gain on sale of intangible asset	$ 75,249,000	$ 0	$ 75,249,000	$ 0		$ 75,200,000