Employee Benefit Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / Family	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
401(k) deferred compensation and profit sharing plan, company contributions	$ 999	$ 926	$ 882
Annual losses per covered family (in USD per family) | $ / Family	125,000
Charges to earnings for self-insurance reserve	$ 2,666	2,066	2,599
Postretirement Medical and Life Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in 2016	62
Certain directors and officers
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits payable	1,568	1,699
Deferred compensation expense	149	172	173
Certain officers
Defined Benefit Plan Disclosure [Line Items]
Accrued benefits payable	267	254
Deferred compensation expense	$ 215	$ 77	$ 166