Employee Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Amounts recognized in the consolidated balance sheets
Employee benefit plan assets	$ 14,328	$ 0
Employee benefit plan obligations	(39,477)	(53,131)
Pension Benefits
Amounts recognized in the consolidated balance sheets
Accrued expenses	(254)	(202)
Employee benefit plan assets	14,328	0
Employee benefit plan obligations	(6,824)	(17,831)
Net amount recognized	7,250	(18,033)
Postretirement Benefits
Amounts recognized in the consolidated balance sheets
Accrued expenses	(1,244)	(1,241)
Employee benefit plan assets	0	0
Employee benefit plan obligations	(32,139)	(34,813)
Net amount recognized	$ (33,383)	$ (36,054)