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Retirement Plans Employee Retirement Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 4.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent 100% of the first 3% and 50% of the next 2%    
Defined Contribution Plan, Cost Recognized $ 1,383 $ 1,080 $ 1,074
Supplemental Employee Retirement Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Year of Benefit 20 years