Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net $ 4,860 $ 4,518 $ 14,348 $ 10,253
Tax expense (benefit) 5,754 4,571 10,668 17,122
Reclassification net of tax $ (9,210) $ (7,201) (20,528) (28,518)
Interest rate swap | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net       292
Tax expense (benefit)       (111)
Reclassification net of tax       181
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     (81) (95)
Tax expense (benefit)     31 36
Reclassification net of tax     (50) (59)
Pension Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     543 543
Tax expense (benefit)     (207) (206)
Reclassification net of tax     336 $ 337
Unrealized Net Loss on Interest Rate Swap | Interest rate swap        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net     264  
Tax expense (benefit)     (100)  
Reclassification net of tax     $ 164