Accumulated Other Comprehensive Income (Loss) (Reclassification) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ (76)		$ (177)		$ (1,268)		$ (766)
Income before income tax expense	16,485		7,862		36,980		17,712
Income tax benefit (expense)	(5,583)		(2,279)		(11,498)		(5,152)
Income from continuing operations	10,902		5,583		25,482		12,560
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	(1)				322
Income tax benefit (expense)	0				(113)
Income from continuing operations	(1)				209
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]	1,511	[1]	0	[1]	1,545
Actuarial losses	191	[1]	1,130	[1]	405	[1]	2,690
Income before income tax expense	191		2,641		405		4,235
Income tax benefit (expense)	(67)		(924)		(142)		(1,482)
Income from continuing operations	$ 124		$ 1,717		$ 263		$ 2,753

[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.