Accumulated Other Comprehensive Income (Loss) (Reclassification) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ (1,191)		$ (589)
Income before income tax expense	20,495		9,849
Income tax benefit (expense)	(5,915)		(2,873)
Income from continuing operations	14,580		6,976
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gain (loss) on derivative instruments [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	323
Income tax benefit (expense)	(113)
Income from continuing operations	210
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of defined benefit pension and other post-retirement benefit items [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	0	[1]	35	[1]
Actuarial losses	214	[1]	1,559	[1]
Income before income tax expense	214		1,594
Income tax benefit (expense)	(75)		(557)
Income from continuing operations	$ 139		$ 1,037

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension cost. See Note 8 - "Pension Benefits and Other Postretirement Benefit Plans" for additional details.