Employee Benefit Plans (Details 14) (SERP, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
SERP
Prepaid pension cost as of beginning of fiscal year	$ (6,075)	$ (5,507)
Net periodic pension cost for fiscal year	(602)	(673)	(885)
Benefits paid	146	105	105
Effect of curtailment	(83)
Prepaid pension asset as of end of fiscal year	$ (6,614)	$ (6,075)	$ (5,507)