Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Goodwill [Roll Forward]
Balance as of December 31, 2013	$ 307,365,845us-gaap_Goodwill
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod
Divestitures	0
Impairments	0us-gaap_GoodwillImpairmentLoss
Other	0us-gaap_GoodwillOtherChanges
Balance as of December 31, 2014	$ 307,365,845us-gaap_Goodwill

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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