SCHEDULE II - Valuation and Qualifying Accounts (Details) (Reserve deducted from assets: accumulated provision for uncollectible accounts., USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reserve deducted from assets: accumulated provision for uncollectible accounts.
Valuation and Qualifying Accounts
Balance At Beginning Of Period	$ 1,387,673	$ 1,137,644	$ 865,236
Charged To Income	2,213,988	3,052,397	3,737,630
Charged to Other Accounts	2,013,959	1,956,549	1,847,527
Deductions From Reserve	4,590,443	4,758,917	5,312,749
Balance At Close of Period	$ 1,025,177	$ 1,387,673	$ 1,137,644