Income Taxes - Deferred Tax Balances (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current [Member]
Retirement benefits	$ 568	$ 585
Allowance for doubtful accounts	2,237	1,990
Insurance and litigation reserves	615	677
Postretirement benefits	0	0
Supplemental retirement benefits	0	0
Performance incentives	3,821	3,858
Equity-based compensation	353	351
Alternative minimum tax carryforward	0	0
Insurance settlement	0	6
Operating loss carryforward	0	0
Uncertain tax positions	0	0
Interest rate swaps and other	1,293	975
Deferred Tax Assets, Gross, Total	8,887	8,442
Valuation allowance	(900)	(924)
Total deferred income tax assets, net	7,987	7,518
Depreciation	0	0
Europe Pension and Other	0	0
Amortization and other	353	749
Total deferred income tax liabilities	353	749
Non Current [Member]
Retirement benefits	11,179	9,371
Allowance for doubtful accounts	0	0
Insurance and litigation reserves	245	126
Postretirement benefits	2,137	1,951
Supplemental retirement benefits	3,448	3,010
Performance incentives	884	686
Equity-based compensation	939	585
Alternative minimum tax carryforward	0	0
Insurance settlement	8,429	9,071
Operating loss carryforward	8,657	9,228
Uncertain tax positions	4,313	5,806
Interest rate swaps and other	780	888
Deferred Tax Assets, Gross, Total	41,011	40,722
Valuation allowance	(6,445)	(6,742)
Total deferred income tax assets, net	34,566	33,980
Depreciation	4,616	4,712
Europe Pension and Other	1,654	2,343
Amortization and other	12,468	8,930
Total deferred income tax liabilities	$ 18,738	$ 15,985