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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Accumulated other comprehensive loss, beginning balance $ (93,347) $ (89,802)
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, net of tax of $142 in 2016   242
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, tax 0 142
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss), net of tax of $4,016 and $(2,353) in 2017 and 2016, respectively 9,795 (3,787)
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss), tax 4,016 (2,353)
Net current-period other comprehensive income (loss) 9,795 (3,545)
Reclassification of disproportionate tax effects from AOCL (19,370)  
Accumulated other comprehensive loss, ending balance (102,922) (93,347)
Gains and Losses on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Accumulated other comprehensive loss, beginning balance 0 (242)
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, net of tax of $142 in 2016   242
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss), net of tax of $4,016 and $(2,353) in 2017 and 2016, respectively 0 0
Net current-period other comprehensive income (loss) 0 242
Accumulated other comprehensive loss, ending balance 0 0
Defined Benefit Pension Items    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Accumulated other comprehensive loss, beginning balance (93,676) (89,740)
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, net of tax of $142 in 2016   0
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss), net of tax of $4,016 and $(2,353) in 2017 and 2016, respectively 10,150 (3,936)
Net current-period other comprehensive income (loss) 10,150 (3,936)
Reclassification of disproportionate tax effects from AOCL (19,429)  
Accumulated other comprehensive loss, ending balance (102,955) (93,676)
Other    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Accumulated other comprehensive loss, beginning balance 329 180
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, net of tax of $142 in 2016   0
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss), net of tax of $4,016 and $(2,353) in 2017 and 2016, respectively (355) 149
Net current-period other comprehensive income (loss) (355) 149
Reclassification of disproportionate tax effects from AOCL 59  
Accumulated other comprehensive loss, ending balance $ 33 $ 329