General Insurance Expenses (Tables)

12 Months Ended

Dec. 31, 2014

Selling, General and Administrative Expense [Abstract]

Summary of significant components of general insurance expenses

The following table summarizes the significant components of general insurance expenses:

	Year Ended December 31,
	2014		2013		2012
Compensation	$	406,601	$	359,280	$	335,212
Commissions	210,797		184,238		180,529
Other	163,593		106,829		80,908
Total general insurance expenses	$	780,991	$	650,347	$	596,649