Income Taxes (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Pension, compensation and other employee benefits	$ 26,790,000	$ 22,103,000
Tax credit carryforwards	25,290,000	25,219,000
Provisions for losses	15,229,000	16,038,000
State income taxes	2,813,000	2,400,000
Net operating loss carryforward	1,755,000	3,086,000
Deferred income		125,000
Other deferred income tax assets	5,331,000	1,745,000
Total deferred tax assets	77,208,000	70,716,000
Valuation allowance	(14,576,000,000)	(356)
Net deferred tax assets	61,642,000	70,360,000
Deferred tax liabilities:
Property and equipment	(8,801,000)	(7,729,000)
Goodwill and other intangible assets	(2,841,000)	(1,006,000)
Unremitted foreign earnings	(978,000)
Other deferred income tax liabilities	(176,000)	(287,000)
Total deferred tax liabilities	(11,261,000)	(9,022,000)
Foreign deferred tax liabilities included above	2,024,000	1,617,000
United States deferred tax assets	52,405,000	62,955,000
Foreign Tax Authority [Member]
Deferred tax assets:
Total deferred tax assets	$ (990,000)