Comprehensive Income Reclassification out of Accumulated other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications									$ 19,301	$ (14,749)	$ (18,650)
Revenues	$ 408,099	$ 408,703	$ 349,829	$ 391,104	$ 379,984	$ 410,955	$ 383,208	$ 404,116	1,557,735	1,578,263	1,757,295
Other - net									(6,839)	(2,380)	64
Total before tax									(314,199)	(108,139)	20,205
Income tax expense									64,816	6,943	3,671
Income (loss) from continuing operations									(379,015)	(115,082)	16,534
Amounts reclassified from AOCI to net income (loss)									(5,248)	(2,880)	965
Other Comprehensive Income (Loss), Net Transfer From To Former Parent											(11,542)
Other Comprehensive Income (Loss), Net of Tax									14,053	(17,629)	(17,685)
Accumulated other comprehensive loss	(22,429)				(36,482)				(22,429)	(36,482)	(18,853)	$ 10,374
Currency translation gain (loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications									16,150	(24,494)	(19,459)
Amounts reclassified from AOCI to net income (loss)									0	0	0
Other Comprehensive Income (Loss), Net Transfer From To Former Parent											(11,585)
Other Comprehensive Income (Loss), Net of Tax									16,150	(24,494)	(31,044)
Accumulated other comprehensive loss	(27,837)				(43,987)				(27,837)	(43,987)	(19,493)	11,551
Net unrealized gain (loss) on investments (net of tax)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications									99	7	(49)
Amounts reclassified from AOCI to net income (loss)									(24)	0	27
Other Comprehensive Income (Loss), Net Transfer From To Former Parent											0
Other Comprehensive Income (Loss), Net of Tax									75	7	(22)
Accumulated other comprehensive loss	38				(37)				38	(37)	(44)	(22)
Net unrealized gain (loss) on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications									3,204	2,046	339
Amounts reclassified from AOCI to net income (loss)									(2,269)	(3,030)	1,133
Other Comprehensive Income (Loss), Net Transfer From To Former Parent											437
Other Comprehensive Income (Loss), Net of Tax									935	(984)	1,909
Accumulated other comprehensive loss	1,737				802				1,737	802	1,786	(123)
Net unrealized gain (loss) on derivative instruments | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenues									10,059	4,624	546
Cost of Goods Sold									(118)	195	155
Other - net									(7,438)	(1,221)	(24)
Total before tax									2,503	3,598	677
Income tax expense									234	568	149
Income (loss) from continuing operations									2,269	3,030	528
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Goods Sold									2,912	254	(1,475)
Income tax expense									(43)	404	(1,168)
Income (loss) from continuing operations									2,955	(150)	(307)
Realized Gain Loss On Sale Of Investment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other - net									38	0	(42)
Income tax expense									14	0	(15)
Income (loss) from continuing operations									24	0	(27)
Net unrecognized gain (loss) related to benefit plans (net of tax)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss) before reclassifications									(152)	7,692	519
Amounts reclassified from AOCI to net income (loss)									(2,955)	150	(195)
Other Comprehensive Income (Loss), Net Transfer From To Former Parent											(394)
Other Comprehensive Income (Loss), Net of Tax									(3,107)	7,842	(70)
Accumulated other comprehensive loss	$ 3,633				$ 6,740				$ 3,633	$ 6,740	(1,102)	$ (1,032)
Including net transfers from parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net of Tax											$ (29,227)