Employee Benefits Plans (Details) - Amount recognized in the consolidated balance sheet - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Compensation Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in the consolidated balance sheet [Line Items]
Current liabilities	$ (448)	$ (448)
Noncurrent liabilities	(4,301)	(4,964)
Total	(4,749)	(5,412)
Supplemental Employee Retirement Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in the consolidated balance sheet [Line Items]
Current liabilities	(155)	(158)
Noncurrent liabilities	(1,797)	(1,971)
Total	(1,952)	(2,129)
Other Postretirement Benefit Plan [Member]
Employee Benefits Plans (Details) - Amount recognized in the consolidated balance sheet [Line Items]
Current liabilities	(92)	(98)
Noncurrent liabilities	(735)	(834)
Total	$ (827)	$ (932)