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Employee Benefit Plans (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]              
Discretionary contribution as percentage of employee's base pay           15.00%  
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 63,500          
Vesting period of employer discretionary contribution   2 years          
Defined Contribution Plan, Cost Recognized           $ 1,000,000 $ 1,000,000
Lump sum paid in lieu of pension benefits       $ 1,700,000      
Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption           the 25-year average return on pension portfolio assets was 7.68%, exceeding the expected long-term return of 7.00% utilized for 2016. Based on the actual performance experience noted above and long-term returns of relevant indices, a case could be built for retaining the expected returns at the existing level. However, there are a number of reasons that would support a lowering of the expected return. For example, since the early 1980s, there has been a general trend of lower interest rates that have supported bond market performance in a positive manner. Such support would likely be reversed if the general trend in rates reverses for an extended period. Since bond market exposure represents a significant portion of pension plan assets, weaker performance from bonds would be reflected in pension returns. Also, expectations from global economic growth continue to be muted, despite the efforts of the efforts of central banks around the world. Further, long-term average returns of benchmark indices are impacted by favorable markets during the 1990s that may or may not be repeated in the foreseeable future.  
Subsequent Event [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 112,708            
Pension [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Accumulated Benefit Obligation       $ 38,200,000   $ 38,200,000 36,100,000
Average return on pension portfolio assets       7.68%   7.68%  
Expected long-term return on pension portfolio assets       7.00%   7.00%  
Defined Benefit Plan, Contributions by Employer         $ 3,000,000 $ 3,000,000 2,000,000
Pension [Member] | Subsequent Event [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Contributions by Employer     $ 3,000,000        
SERP [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Defined Contribution Plan, Cost Recognized   $ 31,770          
Defined Benefit Plan, Accumulated Benefit Obligation       $ 6,300,000   6,300,000 5,400,000
Defined Benefit Plan, Contributions by Employer           $ 141,000 $ 88,000