Consolidated Statements of Comprehensive Income Parenthetical (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	9 Months Ended
Jun. 30, 2013	Dec. 31, 2011	Sep. 30, 2013	Dec. 31, 2011
Pension and postretirement adjustments, income taxes	$ 644	$ (957)	$ 644	$ (957)
Unrealized gain on cash flow hedge, tax	$ 131	$ 69	$ 131	$ 69

Amount of tax expense (benefit) related to (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i-k)

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration