Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2014

Employee Benefit Plans (Tables) [Abstract]

Schedule of the components of net periodic benefit cost

	For the three months ended March 31,
	2014		2013
Components of net periodic benefit cost:
Service cost	$	4,739	$	3,913
Interest cost		7,404		6,784
Expected return on plan assets		(3,925)		(3,400)
Amortization of unrealized losses		4,354		6,398
Net periodic benefit costs	$	12,572	$	13,695