Employee Benefit Plans (Schedule of Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Projected benefit obligation:
Balance, January 1	$ 78,369	$ 81,342
Service cost	3,559	3,795
Interest cost	3,505	3,178
Actuarial (gain) loss	2,003	(8,358)
Benefits paid	(1,885)	(1,588)
Balance, December 31	85,551	78,369
Plan assets:
Fair value, January 1	71,174	72,972
Actual return	3,879	(210)
Employer contribution
Benefits paid	(1,885)	(1,588)
Fair value, December 31	73,168	71,174
Funded status:
Accrued pension liability	$ (12,383)	$ (7,195)