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Network
2414404 - Disclosure - Pension and other postretirement benefits - Change in benefit obligation (Details)
(http://www.centuryca.com/role/PensionAndOtherPostretirementBenefitsChangeInBenefitObligationDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000949157 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Defined Benefit Pension Plans [Member]Other Postretirement Benefit Plans [Member]Defined Benefit Pension Plans [Member]Other Postretirement Benefit Plans [Member]Defined Benefit Pension Plans [Member]Other Postretirement Benefit Plans [Member]
Change in benefit obligation [Roll Forward]
 
 
 
 
 
 
Benefit obligation at beginning of year
326,571,000  
132,550,000  
336,292,000  
158,781,000  
  
Service cost
4,651,000  
1,003,000  
6,346,000  
1,970,000  
5,605,000  
1,591,000  
Interest cost
13,892,000  
5,595,000  
13,388,000  
5,985,000  
11,629,000  
6,420,000  
Plan amendments
0  
0  
0  
(1,758,000) 
  
Actuarial loss (gain)
12,761,000  
1,919,000  
(11,429,000) 
(18,150,000) 
  
Medicare Part D
0  
38,000  
0  
0  
  
Benefits paid
(29,828,000) 
(7,249,000) 
(19,247,000) 
(5,878,000) 
  
Curtailment
0  
0  
1,221,000  
(8,400,000) 
  
Benefit obligation at end of year
328,047,000  
 
133,856,000  
 
326,571,000  
 
132,550,000  
 
336,292,000  
 
158,781,000