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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net $ 4,379 $ 4,860 $ 12,420 $ 14,348
Tax expense (benefit) 1,148 5,754 6,802 10,668
Reclassification net of tax $ (9,790) $ (9,210) (28,819) (20,528)
Interest rate swap | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net       264
Tax expense (benefit)       (100)
Reclassification net of tax       164
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     (156) (81)
Tax expense (benefit)     41 31
Reclassification net of tax     (115) (50)
Pension Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     528 543
Tax expense (benefit)     (137) (207)
Reclassification net of tax     391 $ 336
Unrealized Net Loss on Interest Rate Swap | Interest rate swap        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net     334  
Tax expense (benefit)     (87)  
Reclassification net of tax     $ 247