Goodwill And Indefinite-Lived Intangible Assets Impairment Test - Intangible Assets (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Jul. 17, 2013 Oxford Acquisition [Member]
Goodwill [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			$ 3,793,000
Definite-lived intangible assets, gross carrying amount	79,022,000	75,229,000
Definite-lived intangible assets, accumulated amortization	(36,459,000)	(29,599,000)
Intangible Assets, Net (Excluding Goodwill)	205,864,000	143,141,000
Definite-lived intangible assets, net book value	42,563,000	45,630,000
Indefinite-lived intangible assets, gross carrying value	163,301,000	97,511,000
Intangible Assets Excluding Goodwill, Gross	242,323,000	172,740,000
Goodwill			47,812,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			$ 63,300,000