Debt Obligations (Sr. Term Loan) (Details) (USD $) In Millions, unless otherwise specified		0 Months Ended	1 Months Ended	12 Months Ended
	Sep. 30, 2012	May 31, 2012 [SeniorLoansMember]	Aug. 31, 2010 [SeniorLoansMember] [CyanPartnersLimitedPartnershipMember]	Dec. 31, 2012 [SeniorLoansMember] [CyanPartnersLimitedPartnershipMember]
Debt Instrument [Line Items]
Initial Line Of Credit Facility Maximum Borrowing Capacity				$ 150
Payments of Financing Costs			10.0	25.4
Line of Credit Facility, Maximum Borrowing Capacity	125			235
Early Repayment of Senior Debt		255
Debt Instrument Prepayment Fee Amount		$ 7