Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Tax credit carryforwards	$ 19,529	$ 21,783
Pension, compensation, and other employee benefits	23,212	23,501
Provisions for losses	11,119	12,127
Net operating loss carryforward	4,310	4,886
State income taxes	2,944	2,979
Other deferred income tax assets	3,456	3,927
Total deferred tax assets	64,570	69,203
Valuation allowance	(2,837)	(3,781)
Foreign deferred tax assets included above	(2,460)	(1,536)
Net deferred tax assets	59,273	63,886
Deferred tax liabilities:
Property and equipment	(3,510)	(5,856)
Deferred tax related to life insurance	(5,316)	(4,962)
Goodwill and other intangible assets	(4,038)	(2,705)
Other deferred income tax liabilities	(1,115)	(1,452)
Total deferred tax liabilities	(13,979)	(14,975)
Foreign deferred tax liabilities included above	3,471	3,671
United States net deferred tax assets	$ 48,765	$ 52,582