Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net $ 2,863 $ 2,779 $ 5,735 $ 5,233
Tax expense (benefit) 9,223 7,850 12,551 8,070
Reclassification net of tax $ (16,105) $ (12,918) (21,317) (13,296)
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     (63) (34)
Tax expense (benefit)     24 13
Reclassification net of tax     (39) (21)
Pension Liability | Amount reclassified from accumulated other comprehensive income        
Amounts reclassified from accumulated other comprehensive loss:        
Actuarial (gains) losses     362 510
Tax expense (benefit)     (137) (194)
Reclassification net of tax     225 $ 316
Unrealized Net Loss on Interest Rate Swap | Interest rate swap        
Amounts reclassified from accumulated other comprehensive loss:        
Interest expense, net     195  
Tax expense (benefit)     (74)  
Reclassification net of tax     $ 121