Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2,247	$ 3,104	$ 3,419
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1:	3,104	3,419	3,530
Additions based on tax positions related to current year	464	490	516
Additions based on tax positions of prior years	0	0	0
Reductions for tax positions of prior years	(252)	(477)	(567)
Settlements	(1,069)	(328)	(60)
Balance at December 31:	2,247	3,104	$ 3,419
Accrued interest and penalties	$ 907	$ 1,065
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	3.80%	3.50%	3.60%
Other, net	1.20%	1.80%	1.20%
Effective tax rate	40.00%	40.30%	39.80%
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Income before Income Taxes, Domestic	$ 143,144	$ 136,656	$ 127,858
Income before Income Taxes, Foreign	9,197	10,155	7,093
Income before provision for income taxes	152,341	146,811	134,951
Provisions for Income Taxes Recorded in the Consolidated Statements of Income [Abstract]
U.S. Federal, current expense	46,174	44,713	47,790
State, current expense	7,996	7,266	7,066
Foreign, current expense	2,666	3,058	2,217
Total current expense	56,836	55,037	57,073
U.S. Federal, deferred expense	3,224	4,049	(2,983)
State, deferred expense	958	47	(458)
Foreign, deferred expense	(9)	(8)	45
Total deferred expense (benefit)	4,173	4,088	(3,396)
Total income tax provision	61,009	59,125	$ 53,677
Components of Deferred Tax Assets and Liabilities [Abstract]
Postretirement benefits	29,184	29,736
Payroll accruals	2,995	2,912
Bad debt reserves	1,653	2,106
Other deferred tax assets	9,438	8,623
Pension	60,645	42,836
Inventory	7,173	3,351
Subtotal	111,088	89,564
less: valuation allowances	(402)	(393)
Deferred tax assets	110,686	89,171
Fixed assets	(40,086)	(33,857)
Computer software	(6,412)	(3,904)
Other deferred tax liabilities	(2,438)	(1,974)
Deferred tax liabilities	(48,936)	(39,735)
Net deferred tax assets	61,750	49,436
Deferred Tax Assets, Net, Classification [Abstract]
Deferred tax assets, included in other non-current assets	62,047	49,801
Deferred tax liabilities included in other non-current liabilities	(297)	(365)
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]
Foreign net operating losses	349	363
State net operating losses	563	759
Undistributed earnings of non-U.S. subsidiaries	$ 72,488	66,297
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Non-current tax assets reclassified from current		(2,777)
Current deferred tax assets reclassified to non-current		2,777
Non-current tax liabilities reclassified from current		(365)
Current deferred tax liabilities reclassified to non-current		$ 365