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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance $ (102,922) $ (93,347)
Other comprehensive income before reclassifications 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (740) (695)
Ending balance (102,182) (92,668)
Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Loss [Roll Forward]    
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [1] 740 679
Net current-period other comprehensive income 740 679
Defined Benefit Pension Items    
Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance (102,955) (93,676)
Other comprehensive income before reclassifications 0 0
Ending balance (102,215) (92,981)
Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Loss [Roll Forward]    
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [1]   695
Net current-period other comprehensive income 740 695
Actuarial gain (loss) tax amount 248 423
Other    
Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning balance 33 329
Other comprehensive income before reclassifications 0 0
Ending balance 33 313
Other | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Loss [Roll Forward]    
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [1] 0 (16)
Net current-period other comprehensive income $ 0 $ (16)
[1] Actuarial gain (loss) is included in defined benefit pension plan expense in the Condensed Consolidated Statements of Operations