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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance $ (101,442) $ (91,989) $ (102,922) $ (93,347)
Other comprehensive income before reclassifications 0 0 0 0
Actuarial gain (loss), net of tax [1] 2,316      
Ending balance (99,126) (91,270) (99,126) (91,270)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1] 2,316 719 3,796 2,077
Net current-period other comprehensive income 2,316 719 3,796 2,077
Defined Benefit Pension Items        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance (101,475) (92,286) (102,955) (93,676)
Other comprehensive income before reclassifications 0 0 0 0
Ending balance (99,159) (91,552) (99,159) (91,552)
Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1]   734 3,796 2,124
Net current-period other comprehensive income 2,316 734 3,796 2,124
Actuarial gain (loss) tax amount 777 449 1,274 1,295
Other        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance 33 297 33 329
Other comprehensive income before reclassifications 0 0 0 0
Ending balance 33 282 33 282
Other | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1] 0 (15) 0 (47)
Net current-period other comprehensive income $ 0 $ (15) $ 0 $ (47)
[1] Actuarial gain (loss) is included in defined benefit pension plan expense in the condensed consolidated statements of operations