Debt Obligations (Revolving Credit Facility Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 24, 2014	Sep. 30, 2012
Line of Credit Facility [Line Items]
Private placement offering amount		$ 255,000,000	$ 125,000,000
Cyan Partners Limited Partnership [Member]
Line of Credit Facility [Line Items]
Issuance date	Apr. 12, 2012
Private placement offering amount	$ 115,000,000