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Supplemental Equity Information - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, before tax $ 0 $ 50
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, before tax 2,075 1,850
Accumulated Defined Benefit Plans Adjustment    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, before tax 2,075 1,900
Income tax effect (797) (738)
Total reclassifications, net of tax $ 1,278 $ 1,162