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Lease Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 sqft	Dec. 31, 2012	Jan. 31, 2014 sqft
Long-term Purchase Commitment [Line Items]
Rent expense, net	$ 6.0us-gaap_OperatingLeasesRentExpenseNet	$ 6.3us-gaap_OperatingLeasesRentExpenseNet	$ 6.2us-gaap_OperatingLeasesRentExpenseNet
Area of principal executive office space		132,000us-gaap_AreaOfRealEstateProperty		58,000us-gaap_AreaOfRealEstateProperty
Lease obligations, noncurrent	0.1us-gaap_AccruedRentNoncurrent
Unused office space [Member]
Long-term Purchase Commitment [Line Items]
Lease obligations	$ 0.1		$ 1.0
Sublet to independent third party [Member]
Long-term Purchase Commitment [Line Items]
Area of principal executive office space	7,000

Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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