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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year $ 0    
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year 8,055    
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year $ 0    
Weighted average discount rate used to determine net periodic benefit cost 4.00% 5.00% 4.00%
Rate of compensation increase to determine the net periodic benefit cost 4.00% 4.00% 4.00%
Expected long-term rate of return on plan assets 7.50% 7.50% 7.50%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation 4.38% 4.00% 5.00%
Defined contribution plans, employer contribution plans, employer contribution percentage, maximum 3.00%    
Defined contribution plans, employer contribution percentage, for new hires, minimum 3.00%    
Defined contribution plans, employer contribution percentage, for new hires, maximum 8.00%    
Vested contribution after three years, percentage 100.00%    
Defined contribution plans vesting period, years 3 years    
Defined contribution plan employer contribution percentage for branch offices, minimum 5.00%    
Defined contribution plan employer contribution percentage for branch offices, maximum 17.70%    
Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets consist of shares in investment trusts, percentage 80.00%    
Fixed Maturities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets consist of shares in investment trusts, percentage 17.00%    
Cash [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets consist of shares in investment trusts, percentage 3.00%    
Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation percentage 70.00%    
Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target asset allocation percentage 30.00%    
Pre-Medicare Claims [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Healthcare inflation rate 7.00%    
Healthcare inflation rate decreased 4.50%    
Post-Medicare Claims [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Healthcare inflation rate 6.20%    
Healthcare inflation rate decreased 4.50%    
Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Estimated transition obligation amortized from accumulated other comprehensive income into net public benefit cost over the next year $ 0    
Estimated actuarial loss amortized from accumulated other comprehensive income into net periodic benefit cost over the next year 193    
Estimated prior service cost amortized from accumulated other comprehensive income into net periodic benefit cost over the next year $ 0    
Weighted average discount rate used to determine net periodic benefit cost 4.00% 5.00% 4.00%
Weighted average discount rates used to determine actuarial present value of the projected benefit obligation 4.38% 4.00% 5.00%