Quarterly report pursuant to Section 13 or 15(d)

Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details)

v3.10.0.1
Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net $ 4,096 $ 4,192 $ 8,041 $ 9,488
Tax expense (benefit) 6,916 7,608 5,654 4,914
Reclassification net of tax $ (20,870) $ (14,559) (19,020) (11,319)
Interest rate swap | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net       194
Tax expense (benefit)       (74)
Reclassification net of tax       120
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     (104) (54)
Tax expense (benefit)     27 21
Reclassification net of tax     (77) (33)
Pension Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     352 362
Tax expense (benefit)     (92) (138)
Reclassification net of tax     260 $ 224
Unrealized Net Loss on Interest Rate Swap | Interest rate swap        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net     201  
Tax expense (benefit)     (52)  
Reclassification net of tax     $ 149