Transactions with Related Party (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2005 SHG person	Jun. 30, 2012 SHG	Jun. 30, 2011 SHG	Jun. 30, 2012 SHG person	Jun. 30, 2011 SHG	Dec. 31, 2011 SHG	Feb. 28, 2006 Laurel Y	Jun. 30, 2012 Laurel	Jun. 30, 2011 Laurel	Jun. 30, 2012 Laurel	Jun. 30, 2011 Laurel	Dec. 31, 2011 Laurel
Transactions with Related Party
Number of directors serving as chief executive officer of related entity						1			1
Senior subordinated notes purchased in open market						$ 10,000,000
Face rate of senior subordinated notes (as a percent)						11.00%			11.00%		11.00%
Effective yield on senior subordinated notes (as a percent)						11.10%			11.10%		11.10%
Investment in senior subordinated notes of related party					6,500,000						6,500,000
Interest income related to senior subordinated notes	55,000	180,000	235,000	360,000			55,000	180,000	235,000	360,000
Period of master lease agreement (in years)												15
Rental income	1,095,000	1,068,000	2,181,000	2,127,000									1,095,000	1,068,000	2,181,000	2,127,000
Straight-line rental income	31,000	57,000	70,000	123,000									31,000	57,000	70,000	123,000
Straight-line rental income receivable from subsidiaries	$ 3,130,000		$ 3,130,000		$ 3,060,000								$ 3,130,000		$ 3,130,000		$ 3,060,000