Employee Benefit Plans - Summary of amounts recognized in consolidated balance sheets consist of (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Funded status	$ (13,180)	$ (14,098)
SERP liability	(13,363)	(10,347)
Long-term pension liability	(26,543)	(24,445)
Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
Funded status	$ (13,180)	$ (14,098)