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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance $ (102,182) $ (92,668) $ (102,922) $ (93,347)
Other comprehensive income before reclassifications 0 0 0 0
Actuarial gain (loss), net of tax [1] 740      
Ending balance (101,442) (91,989) (101,442) (91,989)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1] 740 679 1,480 1,358
Net current-period other comprehensive income 740 679 1,480 1,358
Defined Benefit Pension Items        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance (102,215) (92,981) (102,955) (93,676)
Other comprehensive income before reclassifications 0 0 0 0
Ending balance (101,475) (92,286) (101,475) (92,286)
Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1]   695 1,480 1,390
Net current-period other comprehensive income 740 695 1,480 1,390
Actuarial gain (loss) tax amount 249 423 497 846
Other        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance 33 313 33 329
Other comprehensive income before reclassifications 0 0 0 0
Ending balance 33 297 33 297
Other | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Actuarial gain (loss), net of tax [1] 0 (16) 0 (32)
Net current-period other comprehensive income $ 0 $ (16) $ 0 $ (32)
[1] Actuarial gain (loss) is included in defined benefit pension plan expense in the condensed consolidated statements of operations