Summary of Significant Accounting Policies (Summary of Self-Insured Claims) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of Significant Accounting Policies
Amount retained, individual claims	$ 350,000
Amount retained, aggregate claims	1,900,000
Actuarially Determined Self-insurance Expense	1,200,000	$ 1,000,000	$ 800,000
Self-insurance Claims Liability	$ 2,700,000	$ 2,200,000