Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2012 Blaze Acquisition [Member]	Jun. 30, 2012 Cotendo Acquisition [Member]	Mar. 31, 2012 Cotendo Acquisition [Member]	Mar. 06, 2012 Cotendo Acquisition [Member]
Goodwill [Line Items]
Goodwill	$ 709,668	$ 709,628	$ 452,914	$ 709,668
Business acquisition purchase price allocation for goodwill					$ 15,068	$ 40	$ 241,646	$ 241,686