Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 128,543	$ 129,641
Accumulated Amortization	88,955	84,064
Net Carrying Amount	39,588	45,577
Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Net Carrying Amount	541,278	539,728
Franchise Agreements [Member]
Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Net Carrying Amount	496,321	496,321
Wireless Licenses [Member]
Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Net Carrying Amount	22,150	22,150
Licensure and Accreditation [Member]
Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Net Carrying Amount	7,171	7,371
Other [Member]
Indefinite Lived Intangible Assets Excluding Goodwill [Line Items]
Net Carrying Amount	15,636	13,886
Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	13,540	14,008
Accumulated Amortization	12,622	12,546
Net Carrying Amount	918	1,462
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	72,050	73,693
Accumulated Amortization	45,718	40,787
Net Carrying Amount	26,332	32,906
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	10,790	6,457
Accumulated Amortization	6,991	5,707
Net Carrying Amount	3,799	750
Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	22,327	26,634
Accumulated Amortization	16,052	18,185
Net Carrying Amount	6,275	8,449
Other [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	9,836	8,849
Accumulated Amortization	7,572	6,839
Net Carrying Amount	$ 2,264	$ 2,010
Minimum [Member] | Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Minimum [Member] | Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Minimum [Member] | Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	3 years	3 years
Minimum [Member] | Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Minimum [Member] | Other [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	1 year	1 year
Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	10 years
Maximum [Member] | Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	5 years	5 years
Maximum [Member] | Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	10 years	10 years
Maximum [Member] | Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	5 years	5 years
Maximum [Member] | Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	10 years	10 years
Maximum [Member] | Other [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	25 years	25 years