Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 1,755	$ 2,247	$ 3,104
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1:	2,247	3,104	3,419
Additions based on tax positions related to current year	397	464	490
Additions based on tax positions of prior years	0	0	0
Reductions for tax positions of prior years	(889)	(252)	(477)
Settlements	0	(1,069)	(328)
Balance at December 31:	1,755	2,247	$ 3,104
Accrued interest and penalties	$ 650	$ 907
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal tax rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	3.30%	3.80%	3.50%
Other, net	0.90%	1.20%	1.80%
Effective tax rate	39.20%	40.00%	40.30%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income before Income Taxes, Domestic	$ 143,567	$ 143,144	$ 136,656
Income before Income Taxes, Foreign	9,932	9,197	10,155
Income before Provision for Income Taxes	153,499	152,341	146,811
Provisions for Income Taxes Recorded in the Consolidated Statements of Income [Abstract]
U.S. Federal, current expense	33,030	46,174	44,713
State, current expense	4,821	7,996	7,266
Foreign, current expense	2,795	2,666	3,058
Total current expense	40,646	56,836	55,037
U.S. Federal, deferred expense	16,676	3,224	4,049
State, deferred expense	3,008	958	47
Foreign, deferred expense	(144)	(9)	(8)
Total deferred (benefit) expense	19,540	4,173	4,088
Total income tax provision	60,186	61,009	59,125
Components of Deferred Tax Assets and Liabilities [Abstract]
Postretirement benefits	29,788	29,184
Payroll accruals	2,618	2,995
Bad debt reserves	1,322	1,653
Other deferred tax assets	5,251	5,583
Pension	47,847	64,500
Inventory	11,336	7,173
Subtotal	98,162	111,088
less: valuation allowances	(136)	(402)
Deferred tax assets	98,026	110,686
Fixed assets	(40,887)	(40,086)
Computer software	(5,724)	(6,412)
Other deferred tax liabilities	(3,043)	(2,438)
Deferred tax liabilities	(49,654)	(48,936)
Net deferred tax assets	48,372	61,750
Deferred Tax Assets, Net, Classification [Abstract]
Deferred tax assets, included in other non-current assets	48,666	62,047
Deferred tax liabilities included in other current liabilities	(294)	(297)
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Foreign net operating losses	239	349
State net operating losses	529	563
Deferred Tax Assets, Net, Noncurrent			2,777
Deferred Tax Liabilities, Net, Noncurrent			$ 365
Undistributed earnings of non-U.S. subsidiaries	$ 78,767	$ 72,488