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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance $ (92,668) $ (89,108) $ (93,347) $ (89,802)
Other comprehensive income before reclassifications 0 0 0 0
Ending balance (91,989) (88,416) (91,989) (88,416)
Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap [1]   59   118
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [2] 679 633 1,358 1,268
Net current-period other comprehensive income 679 692 1,358 1,386
Gains and Losses on Derivatives        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance 0 (183) 0 (242)
Other comprehensive income before reclassifications 0 0 0 0
Ending balance 0 (124) 0 (124)
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [2] 0 0 0 0
Net current-period other comprehensive income 0 59 0 118
Gains and Losses on Derivatives | Reclassification out of Accumulated Other Comprehensive Income | Interest rate swaps        
Accumulated Other Comprehensive Loss [Roll Forward]        
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap [1]   59   118
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap, tax   37   74
Defined Benefit Pension Items        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance (92,981) (89,098) (93,676) (89,740)
Other comprehensive income before reclassifications 0 0 0 0
Ending balance (92,286) (88,458) (92,286) (88,458)
Defined Benefit Pension Items | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap [1]   0   0
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [2] 695 640 1,390 1,282
Amounts reclassification from accumulated other comprehensive loss, Actuarial gain (loss), tax 423 397 846 793
Net current-period other comprehensive income 695 640 1,390 1,282
Other        
Accumulated Other Comprehensive Loss [Roll Forward]        
Beginning balance 313 173 329 180
Other comprehensive income before reclassifications 0 0 0 0
Ending balance 297 166 297 166
Other | Reclassification out of Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Loss [Roll Forward]        
Amounts reclassified from accumulated other comprehensive loss, Interest rate swap [1]   0   0
Amounts reclassified from accumulated other comprehensive loss, Actuarial gain (loss) [2] (16) (7) (32) (14)
Net current-period other comprehensive income $ (16) $ (7) $ (32) $ (14)
[1] (a) Interest rate swap amortization is included in interest expense in the Condensed Consolidated Statements of Operations
[2] (b) Actuarial gain (loss) is included in defined benefit pension plan expense in the Condensed Consolidated Statements of Operations