Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net $ 4,192 $ 2,863 $ 9,488 $ 5,735
Tax expense (benefit) 7,608 9,223 4,914 12,551
Reclassification net of tax $ (14,559) $ (16,105) (11,319) (21,317)
Interest rate swap | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net       195
Tax expense (benefit)       (74)
Reclassification net of tax       121
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     (54) (63)
Tax expense (benefit)     21 24
Reclassification net of tax     (33) (39)
Pension Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     362 362
Tax expense (benefit)     (138) (137)
Reclassification net of tax     224 $ 225
Unrealized Net Loss on Interest Rate Swap | Interest rate swap        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net     194  
Tax expense (benefit)     (74)  
Reclassification net of tax     $ 120