Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies (Details) [Line Items]
Operating Leases, Rent Expense	$ 2.7us-gaap_LeaseAndRentalExpense	$ 2.7us-gaap_LeaseAndRentalExpense	$ 2.4us-gaap_LeaseAndRentalExpense
Letter of Credit [Member]
Commitments and Contingencies (Details) [Line Items]
Letters of Credit Outstanding, Amount	$ 1.2

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration