Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 62,009	$ 56,913	$ 184,689	$ 181,200
Pension plans and other postretirement benefits:
Prior service credit (cost) arising during the period, net of income tax expense (benefit) of $14,013 in third quarter and nine months 2015	22,009	0	22,009	0
Amortization of prior service cost (credit) included in net periodic benefit cost, net of income tax expense (benefit) of $(93) in third quarter 2015, $5 in third quarter 2014, $(85) in nine months 2015 and $13 in nine months 2014	(157)	(3)	(163)	(9)
Actuarial net gain (loss) arising during the period, net of income tax expense (benefit) of $(1,141) in third quarter 2015, $(504) in third quarter 2014, $(1,141) in nine months 2015 and $(537) in nine months 2014	(1,816)	(501)	(1,816)	(591)
Amortization of actuarial net loss (gain) included in net periodic benefit cost, net of income tax expense (benefit) of $754 in third quarter 2015, $352 in third quarter 2014, $2,288 in nine months 2015 and $1,119 in nine months 2014	1,343	649	4,055	2,061
Settlements and curtailments, net of income tax expense (benefit) of $346 in third quarter 2014 and $608 in nine months 2014	0	727	0	1,126
Amortization of transition obligation (asset) included in net periodic benefit cost, net of income tax expense (benefit) of $1 in nine months 2014	0	0	0	4
Total pension plans and other postretirement benefits	21,379	872	24,085	2,591
Foreign currency translation adjustments, net of income tax expense (benefit) of $291 in third quarter 2015, $(1,261) in third quarter 2014, $(1,075) in nine months 2015 and $(955) in nine months 2014	(15,647)	(18,997)	(22,791)	(9,437)
Other comprehensive income (loss)	5,732	(18,125)	1,294	(6,846)
Comprehensive income	$ 67,741	$ 38,788	$ 185,983	$ 174,354