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Employee Benefit Plan - Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DB Pension Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 77,304 $ 76,219  
Service cost 0 0 $ 1,587
Interest cost 2,501 2,473 2,987
Plan participants’ contributions 0 0  
Amendments 0 0  
Curtailments 0 0  
Actuarial loss (gain) 5,928 1,403  
Benefits paid (2,985) (2,791)  
Benefit obligation at end of year 82,748 77,304 76,219
Change in plan assets:      
Fair value of plan assets at beginning of year 71,807 68,931  
Actual return on plan assets 9,582 4,367  
Plan participants’ contributions 0 0  
Employer contributions 1,750 1,300  
Benefits paid (2,985) (2,791)  
Fair value of plan assets at end of year 80,154 71,807 68,931
Unfunded status (2,594) (5,497)  
Life and Healthcare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,121 8,732  
Service cost 192 258 236
Interest cost 268 283 323
Plan participants’ contributions 98 185  
Amendments (964) 0  
Curtailments 0 0  
Actuarial loss (gain) 708 210  
Benefits paid (428) (547)  
Benefit obligation at end of year 8,995 9,121 8,732
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 98 185  
Employer contributions 330 362  
Benefits paid (428) (547)  
Fair value of plan assets at end of year 0 0 0
Unfunded status (8,995) (9,121)  
SERPs      
Change in benefit obligation:      
Benefit obligation at beginning of year 23,399 22,160  
Service cost 166 171 201
Interest cost 852 832 928
Plan participants’ contributions 0 0  
Amendments 0 188  
Curtailments 0 0  
Actuarial loss (gain) 2,407 697  
Benefits paid (682) (649)  
Benefit obligation at end of year 26,142 23,399 22,160
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 0 0  
Employer contributions 682 649  
Benefits paid (682) (649)  
Fair value of plan assets at end of year 0 0 $ 0
Unfunded status $ (26,142) $ (23,399)