Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Funded Status
Funded status at end of year	$ (37,624)	$ (33,646)
Amounts recognized in Consolidated Balance Sheets consist of:
Current liabilities	(271)	(218)
Long-term liabilities	(37,353)	(33,428)
Net amount recognized in Consolidated Balance Sheets	$ (37,624)	$ (33,646)