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
Mar. 31, 2017
Mar. 31, 2016
Amounts reclassified from accumulated other comprehensive loss:    
Interest expense, net $ 5,296 $ 2,872
Tax expense (benefit) (2,694) 3,328
Reclassification net of tax 3,233 (5,208)
Interest rate swap | Amount reclassified from accumulated other comprehensive income    
Amounts reclassified from accumulated other comprehensive loss:    
Interest expense, net   97
Tax expense (benefit)   (37)
Reclassification net of tax   60
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income    
Amounts reclassified from accumulated other comprehensive loss:    
Actuarial (gains) losses (27) (32)
Tax expense (benefit) 10 12
Reclassification net of tax (17) (20)
Pension Liability | Amount reclassified from accumulated other comprehensive income    
Amounts reclassified from accumulated other comprehensive loss:    
Actuarial (gains) losses 181 181
Tax expense (benefit) (69) (68)
Reclassification net of tax 112 $ 113
Unrealized Net Loss on Interest Rate Swap | Interest rate swap    
Amounts reclassified from accumulated other comprehensive loss:    
Interest expense, net 97  
Tax expense (benefit) (37)  
Reclassification net of tax $ 60