Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]
Cash	$ 29,364	$ 35,748
Cash equivalents	1,282	8,998
Restricted cash	4,600	6,200
Total cash and cash equivalents	$ 35,286	50,940	$ 36,870	$ 42,679
Distribution period (years)	7 years
Deferred compensation liability	$ 100	500
Deferred compensation plan
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	113	498
Letter of Credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 4,527	$ 5,696