Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Changes in Accumulated Other Comprehensive Loss by Component - Rollforward (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Changes to accumulated other comprehensive loss by component    
Balance at the beginning of the period $ (6,672) $ (6,183)
Other comprehensive earning (loss) before reclassifications (586) (1,834)
Amounts reclassified from accumulated other comprehensive loss 311 307
Balance at the end of the period (6,947) (7,710)
Unrealized Net Loss on Interest Rate Swap    
Changes to accumulated other comprehensive loss by component    
Balance at the beginning of the period (1,195) (937)
Other comprehensive earning (loss) before reclassifications (586) (1,834)
Amounts reclassified from accumulated other comprehensive loss 120 121
Balance at the end of the period (1,661) (2,650)
Other Postretirement Benefit Liability    
Changes to accumulated other comprehensive loss by component    
Balance at the beginning of the period 937 1,048
Amounts reclassified from accumulated other comprehensive loss (33) (39)
Balance at the end of the period 904 1,009
Pension Liability    
Changes to accumulated other comprehensive loss by component    
Balance at the beginning of the period (6,414) (6,294)
Amounts reclassified from accumulated other comprehensive loss 224 225
Balance at the end of the period $ (6,190) $ (6,069)