CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]
Interest rate swap, tax expense	$ (4,877)	$ (10,479)	$ 3,837
Investments, tax expense (benefit)	(56,513)	73,856	5,564
Reclassification adjustment for gains included in net income, net of tax		(11,697)	(5,930)
Conversion of investments from Held-to-Maturity to Available-for-Sale, net of tax			$ 21,630