Accumulated Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes	$ 66,173	$ 81,224	$ 49,722
Tax benefit (expense)	(19,853)	(27,812)	(11,519)
Income from continuing operations	46,320	53,412	$ 38,203
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Unrealized gain (loss) on derivative instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	129	321
Tax benefit (expense)	(45)	(112)
Income from continuing operations	84	209
Amounts reclassified from accumulated other comprehensive income (loss) for the period ended December 31, 2013 | Funded status of pension plans and other postretirement benefits
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes	1,486	6,006
Tax benefit (expense)	(520)	(2,102)
Income from continuing operations	$ 966	$ 3,904