Goodwill and Other Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014 Cable [Member] Wireless Licenses [Member] Scenario, Forecast [Member]	Jun. 30, 2014 Kaplan International [Member] Kaplan China [Member]
Amortized Intangible Assets [Line Items]
Impairment of intangible assets	$ 7,774,000	$ 0	$ 7,774,000	$ 0		$ 7,774,000
Amortization of Intangible Assets
Amortization of intangible assets	3,360,000	3,313,000	6,441,000	7,030,000
Estimated amortization of intangible assets, remainder of 2014	7,000,000		7,000,000
Estimated amortization of intangible assets, 2015	13,000,000		13,000,000
Estimated amortization of intangible assets, 2016	12,000,000		12,000,000
Estimated amortization of intangible assets, 2017	8,000,000		8,000,000
Estimated amortization of intangible assets, 2018	8,000,000		8,000,000
Estimated amortization of intangible assets, 2019	7,000,000		7,000,000
Estimated amortization of intangible assets, after 2019	7,000,000		7,000,000
Indefinite-Lived Intangible Assets [Line Items]
Gain on sale of intangible asset					$ 75,000,000