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Investments (Details) (USD $)	3 Months Ended
Investments (Details) (USD $)	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments	$ 33,600,000us-gaap_CostMethodInvestments
Impairments recognized on investments	0
8% Promissory Note Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Promissory note with privately held company	$ 3,000,000
Interest rate on notes receivable	8.00%

An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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