Cash and Cash Equivalents (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Cash	$ 28,020,000	$ 34,099,000
Cash equivalents	3,840,000	3,484,000
Restricted cash	4,700,000	5,100,000
Total cash and cash equivalents	36,524,000	42,679,000	33,952,000	50,324,000
Distribution period	7 years
Deferred compensation liability	500,000	900,000
Deferred compensation plan
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	526,000	867,000
Letter of Credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 4,138,000	$ 4,229,000