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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 5,561	$ 3,604	$ 15,067	$ 8,338
Other comprehensive income (loss), net of tax:
Pension liability adjustment, net of tax	64	58	129	195
Deferred gain (loss) on cash flow derivatives, net of tax	44	14	155	(17)
Other comprehensive income, net of tax	108	72	284	178
Comprehensive income	$ 5,669	$ 3,676	$ 15,351	$ 8,516

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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