Borrowings - Senior Notes (Details) (USD $)							0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Post-Modification Notes [Member]	Dec. 31, 2012 Post-Modification Notes [Member]	Mar. 22, 2011 Senior Notes [Member] Post-Modification Notes [Member]	Mar. 22, 2011 Senior Notes [Member] Post-Modification Notes [Member] Interest Rate, Pre-Trigger [Member]	Mar. 22, 2011 Senior Notes [Member] Post-Modification Notes [Member] Modification Trigger, One [Member]	Mar. 22, 2011 Senior Notes [Member] Post-Modification Notes [Member] Interest Rate, Post-Trigger [Member]	Mar. 22, 2011 Restriction Release Trigger, One [Member] Senior Notes [Member] Post-Modification Notes [Member]	Mar. 22, 2011 Restriction Release Trigger, Two [Member] Senior Notes [Member] Post-Modification Notes [Member]
Debt Instrument [Line Items]
Face amount of debt					$ 85,900,000
Senior notes	83,320,000	81,728,000	83,300,000	81,700,000
Interest rate						1.00%
Proceeds from equity offering, minimum							40,000,000
Variable rate, description								three-month LIBOR
Basis spread on variable rate								3.50%
Tangible net worth, minimum									$ 40,000,000
Interest coverage ratio, minimum										1.35
Leverage ratio, maximum										95.00%