Transactions with Related Party (Details) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2005 SHG	Mar. 31, 2012 SHG	Dec. 31, 2007 SHG	Feb. 28, 2006 Laurel	Mar. 31, 2013 Laurel	Mar. 31, 2012 Laurel	Dec. 31, 2012 Laurel
Transactions with Related Party
Senior subordinated notes purchased in open market				$ 10,000,000
Face rate of senior subordinated notes (as a percent)				11.00%
Effective yield on senior subordinated notes (as a percent)				11.10%
Remaining investment in senior subordinated notes of related party						6,500,000
Interest income related to senior subordinated notes	0	180,000			180,000
Period of master lease agreement							15 years
Rental income	1,113,000	1,086,000						1,113,000	1,086,000
Straight-line rental income	12,000	39,000						12,000	39,000
Straight-line rental income receivable from subsidiaries	$ 3,203,000		$ 3,191,000					$ 3,203,000		$ 3,191,000