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Employee Benefit Plans Employee Benefit Plans - Various (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net periodic pension expense:      
Interest cost $ 2,285 $ 2,289 $ 2,360
Expected return on plan assets (2,789) (3,199) (3,105)
Amortization of net loss 1,537 1,429 320
Total net periodic pension expense (income) 1,033 519 (425)
Change in projected benefit obligation:      
Projected benefit obligation at beginning of year 58,273 62,107  
Interest cost 2,285 2,289 2,360
Benefits paid (3,857) (3,088)  
Actuarial gains (1,237) (3,035)  
Projected benefit obligation at year end 55,464 58,273 62,107
Change in plan assets:      
Fair value of plan assets at beginning of year 40,990 45,187  
Actual return (loss) 2,969 (1,109)  
Employer contributions 1,000 0  
Benefits paid (3,857) (3,088)  
Fair value of plan assets at year end 41,102 40,990 $ 45,187
Funded status (Accrued pension liabilities) (14,362) (17,283)  
Unrecognized actuarial loss recognized in accumulated other comprehensive loss 16,704 $ 19,657  
Defined Benefit Plan, Amortization of Net Gains (Losses) $ 1,240    
Assumptions used to determine benefit obligation at year end:      
Discount rate 4.00% 4.00% 3.75%
Assumptions used to determine net periodic benefit cost:      
Discount rate 4.00% 3.75% 4.75%
Expected long-term weighted-average rate of return on plan assets 7.00% 7.25% 7.25%
Expected future benefit payments      
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 2,442    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2,631    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2,806    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2,850    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 3,009    
In aggregate during five years thereafter 16,310    
Multiemployer Plan, Period Contributions 287 $ 739 $ 992
Defined contribution expense 9,989 10,818 10,773
Deferred Compensation Arrangement with Individual, Compensation Expense $ 257 $ 255 $ 409