Pension and Other Postretirement Benefits (Changes in Fair Value of Level 3 Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 162,182	$ 151,191
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	1,336	1,401
Transfers into Level 3	0	0
Unrealized gains relating to instruments still held at the reporting date	(39)	21
Benefit payments, administrative expenses and interest income, net	(101)	(86)
Fair value of plan assets at end of year	$ 1,196	$ 1,336