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Savings Plan (Details) - USD ($)
 1 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 1998
Dec. 31, 1997
Savings Plan [Line Items]              
Charges recognized     $ 3,200,000 $ 3,000,000 $ 1,600,000    
Number of common stock purchased           7,200 46,671
Amount of common stock purchased           $ 200,000 $ 1,000,000
Savings Plan              
Savings Plan [Line Items]              
Employee contribution to savings plan   $ 0.50 1        
Defined Contribution Plan Employer Employee Contribution   $ 1 $ 1        
Maximum matching contribution 5.00% 5.00%          
Percentage of enrollment of base pay     3.00%        
Non Qualified Plan [Member]              
Savings Plan [Line Items]              
Liability under the restoration plan     $ 1,600,000 $ 1,000,000      
Liability under the restoration plan, shares     67,013 71,818