Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of net periodic pension expense:
Interest cost	$ 528	$ 552	$ 1,584	$ 1,656
Expected return on plan assets	(676)	(662)	(2,028)	(1,986)
Amortization of net loss	337	244	1,011	731
Total pension expense	$ 189	$ 134	$ 567	$ 401