Deferred Compensation Plan (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended												3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Aug. 01, 2013	May 09, 2014 Subordinated Debt [Member]	Mar. 31, 2014 Subordinated Debt [Member]	Feb. 21, 2014 Subordinated Debt [Member]	Jan. 22, 2014 Subordinated Debt [Member]	Oct. 18, 2013 Subordinated Debt [Member]	Aug. 01, 2013 Subordinated Debt [Member]	Mar. 08, 2013 Subordinated Debt [Member]	Mar. 10, 2010 Subordinated Debt [Member]	Sep. 30, 2014 2014 [Member]	Sep. 30, 2014 2015 through 2017 [Member]	Mar. 31, 2016 Scenario, Actual [Member]
Debt Instrument, Repurchased Face Amount							$ 42,500,000	$ 50,000,000	$ 20,000,000	$ 30,000,000	$ 155,000,000	$ 324,000,000	$ 50,000,000	$ 28,500,000
RDU Plan, units authorized for issuance	28,500		28,500
RDU Plan, units outstanding	28,500		28,500
Deferred Compensation Arrangement with Individual, Requisite Service Period			3 years 0 months 0 days
Redemption premium added to debt face amount, RDU plan			100,000		1,400,000
RDU plan cash retention pool						15,000,000
Charge for payment of RDU Plan cash retention pool	0	7,500,000	0	7,500,000	7,500,000
Second RDU Cash Retention Payment																	7,500,000
RDU Plan, unrecognized compensation expense															2,000,000	7,000,000
RDU Plan, compensation expense	2,200,000	10,400,000	6,600,000	14,700,000
RDU Plan, liability	$ 28,200,000		$ 28,200,000		$ 21,800,000